Table of Contents

Component Description

Volatile Organic Compounds and Trihalomethanes/MTBE (Whole Blood)

Volatile organic compounds (VOCs) are a large group of chemicals that have been used as solvents, degreasers, and cleaning agents in industry and consumer products. Many of the VOCs were found to contaminate ground water and drinking water sources. Because of human health concerns, these VOCs have been banned or restricted from most uses.

The halogenated solvents are VOCs consisting of a hydrocarbon chain or one hydrocarbon substituted with one or more chlorine or bromine atoms. Most of these chemicals are used as degreasers and solvents in various products, such as paint. In the past, 1,1,1-trichloroethane was used as a dry cleaning agent, insect fumigant, and solvent in consumer products. Methylene chloride, tetrachloroethene, and trichloroethene are other VOCs that were widely used in the past.

Benzene, toluene, ethylbenzene, xylene, and styrene, collectively referred to as BTEXS, are components of tobacco smoke. Along with 2,5-dimethylfuran, these VOCs are usually detected in the blood of cigarette smokers at higher levels than in non-smokers. Chlorobenzene (monochlorobenzene) and the three dichlorobenzenes are halogenated aromatic hydrocarbons primarily used in industrial and chemical synthetic processes. Chlorobenzene has been used to produce DDT, phenol, and nitrobenzene. The dichlorobenzenes are also chemical intermediates in the synthesis of dyes, pesticides, and other industrial products. 1,4-Dichlorobenzene (para-dichlorobenzene) is used also as a moth repellent and as a deodorizer. Disinfection by-products (DBP), including bromodichloromethane, dibromochloromethane, bromoform, and chloroform are formed when chlorine interacts with natural organic materials found in water. Primary sources of DBPs are chlorinated drinking water and recreational water bodies, such as swimming pools.

The prevalence of disinfection by-products in drinking water supplies has raised concerns about possible adverse health effects from chronic exposure to these potentially carcinogenic compounds. Methyl-tert-butyl ether (MTBE) was used as an additive to replace lead in gasoline, but its use was banned after widespread ground water contamination was discovered.

Inhalation is the most common VOC route of exposure in the general population, including indoor sources, such as paints, adhesives, cleaning solutions, and aerosolized insecticide sprays; industries producing these solvents; and contaminated waste disposal sites. Drinking water may contribute to exposure when underground drinking water supplies are contaminated. After they are absorbed in the body, VOCs are rapidly eliminated in exhaled breath, or may be rapidly metabolized and eliminated in the urine.

Eligible Sample

Examined participants aged 12 years and older from a one-half sample were eligible.


Description of Laboratory Methodology

An automated analytical method was developed using capillary gas chromatography (GC) and mass spectrometry (MS) with selected-ion monitoring (SIM) detection and isotope-dilution. This method quantifies levels of individual VOCs and Trihalomethanes (THMs) and methyl tert-butyl ether (MTBE) in whole blood to low-parts-per-trillion range. Because non-occupationally exposed individuals have blood VOC concentrations within this range, this method is applicable for determining these quantities and investigating cases of sustained or recent low-level exposure.

Refer to the Laboratory Method Files section for a detailed description of the laboratory methods used.

There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2015-2016 cycle.


Laboratory Method Files

Volatile Organic Compounds (VOCs) & Trihalomethanes/MTBE Laboratory Procedure Manual (September 2018)

Laboratory Quality Assurance and Monitoring

Whole blood specimens were processed, stored, and shipped to Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA for analysis.

Detailed instructions on specimen collection and processing are discussed in the NHANES Laboratory Procedures Manual (LPM). Vials are stored under appropriate refrigerated (2-8°C) conditions until they are shipped to National Center for Environmental Health, for testing.

The NHANES quality assurance and quality control (QA/QC) protocols meet the 1988 Clinical Laboratory Improvement Act mandates. Detailed QA/QC instructions are discussed in the NHANES LPM.

Mobile Examination Centers (MECs)

Laboratory team performance is monitored using several techniques. NCHS and contract consultants use a structured competency assessment evaluation during visits to evaluate both the quality of the laboratory work and the quality-control procedures. Each laboratory staff member is observed for equipment operation, specimen collection and preparation; testing procedures and constructive feedback are given to each staff member. Formal retraining sessions are conducted annually to ensure that required skill levels were maintained.

Analytical Laboratories

NHANES uses several methods to monitor the quality of the analyses performed by the contract laboratories. In the MEC, these methods include performing blind split samples collected on “dry run” sessions. In addition, contract laboratories randomly perform repeat testing on 2% of all specimens.

NCHS developed and distributed a quality control protocol for all CDC and contract laboratories which outlined the use of Westgard rules (Westgard et al., 1981) when running NHANES specimens. Progress reports containing any problems encountered during shipping or receipt of specimens, summary statistics for each control pool, QC graphs, instrument calibration, reagents, and any special considerations are submitted to NCHS quarterly. The reports are reviewed for trends or shifts in the data. The laboratories are required to explain any identified areas of concern.

All QC procedures recommended by the manufacturers were followed. Reported results for all assays meet the Division of Laboratory Services’ quality control and quality assurance performance criteria for accuracy and precision, similar to the Westgard rules (Caudill et al., 2008).

Data Processing and Editing

The data were reviewed. Incomplete data or improbable values were sent to the performing laboratory for confirmation.


Analytic Notes

Refer to the 2015-2016 Laboratory Data Overview for general information on NHANES laboratory data.

Volatile Toxicant Questionnaire

 A volatile toxicant questionnaire (VTQ) was administered on the mobile examination center (MEC), by trained interviewers, using the Computer-Assisted Personal Interview (CAPI) system. The VTQ section includes data about the SP’s home, activities, amount of time spent in various locations, and exposure to different chemicals over the past 48 hours. This questionnaire data can be used in conjunction with the VOC laboratory dataset and found in the Volatile Toxicant Data File in the NHANES 2015-2016 Questionnaire Data section.

Subsample Weights

Whole blood VOCs were measured in a one-half subsample of participants 12 years and older. Special sample weights are required to analyze these data properly. Specific sample weights for this subsample are included in this data file and should be used when analyzing these data.

Demographic and Other Related Variables

The analysis of NHANES laboratory data must be conducted using the appropriate survey design and demographic variables. The NHANES 2015-2016 Demographics File contains demographic data, health indicators, and other related information collected during household interviews as well as the sample design variables. The recommended procedure for variance estimation requires use of stratum and PSU variables (SDMVSTRA and SDMVPSU, respectively) in the demographic data file.

The Fasting Questionnaire file includes auxiliary information such as fasting status, the time of venipuncture, and the conditions precluding venipuncture.

This laboratory data file can be linked to the other NHANES data files using the unique survey participant identifier (i.e., SEQN).

Detection limits

The detection limits were constant for all of the analytes in the data set. Two variables are provided for each of these analytes. The variable name ending in “LC” (ex., LBD2DFLC) indicates whether the result was below the limit of detection: “0” means that the result was at or above the limit of detection, “1” indicates that the result was below the limit of detection. For analytes with analytic results below the lower limit of detection (ex., LBD2DFLC=1), an imputed fill value was placed in the analyte results field. This value is the lower limit of detection divided by square root of 2 (LLOD/sqrt [2]). The other variable prefixed LBX (ex., LBX2DF) provides the analytic result for that analyte. All data are rounded to three significant figures or three decimal places, whichever is less precise.

Lower Limit of Detection (LLOD, in ng/mL) for Whole Blood VOCs:

VARIABLE NAME

SAS LABEL

LLOD

LBX2DF

Blood 2,5-Dimethylfuran (ng/mL)

0.011

LBX4CE

Blood 1,1,1,2-Tetrachloroethane (ng/mL)

0.040

LBXV06

Blood Hexane (ng/mL)

0.122

LBXV07N

Blood Heptane (ng/mL)

0.100

LBXV08N

Blood Octane (ng/mL)

0.100

LBXV1D

Blood 1,2-Dichlorobenzene (ng/mL)

0.025

LBXV2A

Blood 1,2-Dichloroethane (ng/mL)

0.010

LBXV3B

Blood 1,3-Dichlorobenzene (ng/mL)

0.025

LBXV4C

Blood Tetrachloroethene (ng/mL)

0.048

LBXVBF

Blood Bromoform (ng/mL)

0.008

LBXVBM

Blood Bromodichloromethane (ng/mL)

0.006

LBXVBZ

Blood Benzene (ng/mL)

0.024

LBXVBZN

Blood Benzonitrile (ng/mL) 

0.150

LBXVC6

Blood Cyclohexane (ng/mL)

0.020

LBXVCB

Blood Chlorobenzene (ng/mL)

0.011

LBXVCF

Blood Chloroform (ng/mL)

0.008

LBXVCM

Blood Dibromochloromethane (ng/mL)

0.005

LBXVCT

Blood Carbon Tetrachloride (ng/mL)

0.005

LBXVDB

Blood 1,4-Dichlorobenzene (ng/mL)

0.040

LBXVDE

Blood 1,2-Dibromoethane (ng/ml)

0.015

LBXVDEE

Blood Diethyl Ether (ng/mL)

0.040

LBXVDX

Blood 1,4-Dioxane (ng/mL)

0.500

LBXVEA

Blood Ethyl Acetate (ng/mL)

0.158

LBXVEB

Blood Ethylbenzene (ng/mL)

0.024

LBXVEC

Blood Chloroethane (ng/mL)

0.045

LBXVFN

Blood Furan (ng/ml)

0.025

LBXVIBN

Blood Isobutyronitrile (ng/mL)

0.040

LBXVIPB

Blood Isopropylbenzene (ng/ml)

0.040

LBXVMC

Blood Methylene Chloride (ng/mL)

0.250

LBXVMCP

Blood Methylcyclopentane (ng/mL)

0.020

LBXVME

Blood MTBE (ng/mL)

0.010

LBXVNB

Blood Nitrobenzene (ng/mL)

0.320

LBXVOX

Blood o-Xylene (ng/mL)

0.024

LBXVTC

Blood Trichloroethene (ng/mL)

0.012

LBXVTE

Blood 1,1,1-Trichloroethane (ng/mL)

0.010

LBXVTFT

Blood ααα-Trifluorotoluene (ng/mL)

0.040

LBXVTHF

Blood Tetrahydrofuran (ng/mL)

0.125

LBXVTO

Blood Toluene (ng/mL)

0.025

LBXVTP

Blood 1,2,3-Trichloropropane (ng/ml)

0.040

LBXVVB

Blood Vinyl Bromide (ng/mL)

0.045

LBXVXY

Blood m-/p-Xylene (ng/mL)

0.034

Please refer to the NHANES Analytic Guidelines and the on-line NHANES Tutorial for further details on the use of sample weights and other analytic issues.

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Both males and females 12 YEARS - 150 YEARS

WTSVOC2Y - VOC Subsample Weight

Variable Name:
WTSVOC2Y
SAS Label:
VOC Subsample Weight
English Text:
VOC Subsample Weight
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 499733.23816 Range of Values 3394 3394
. Missing 0 3394

LBX2DF - Blood 2,5-Dimethylfuran (ng/mL)

Variable Name:
LBX2DF
SAS Label:
Blood 2,5-Dimethylfuran (ng/mL)
English Text:
Blood 2,5-Dimethylfuran (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.008 to 1.45 Range of Values 3083 3083
. Missing 311 3394

LBD2DFLC - Blood 2,5-Dimethylfuran Comment Code

Variable Name:
LBD2DFLC
SAS Label:
Blood 2,5-Dimethylfuran Comment Code
English Text:
Blood 2,5-Dimethylfuran Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 522 522
1 Below lower detection limit 2561 3083
2 Detectable result and exceeds the calibrated range of assay 0 3083
. Missing 311 3394

LBX4CE - Blood 1,1,1,2-Tetrachloroethane (ng/mL)

Variable Name:
LBX4CE
SAS Label:
Blood 1,1,1,2-Tetrachloroethane (ng/mL)
English Text:
Blood 1,1,1,2-Tetrachloroethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 0.028 3082 3082
. Missing 312 3394

LBD4CELC - Blood 1,1,1,2-Tetrachloroethane Cmt Code

Variable Name:
LBD4CELC
SAS Label:
Blood 1,1,1,2-Tetrachloroethane Cmt Code
English Text:
Blood 1,1,1,2-Tetrachloroethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3082 3082
2 Detectable result and exceeds the calibrated range of assay 0 3082
. Missing 312 3394

LBXV06 - Blood Hexane (ng/mL)

Variable Name:
LBXV06
SAS Label:
Blood Hexane (ng/mL)
English Text:
Blood Hexane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.086 to 26.4 Range of Values 2840 2840
. Missing 554 3394

LBDV06LC - Blood Hexane Comment Code

Variable Name:
LBDV06LC
SAS Label:
Blood Hexane Comment Code
English Text:
Blood Hexane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 19 19
1 Below lower detection limit 2821 2840
2 Detectable result and exceeds the calibrated range of assay 0 2840
. Missing 554 3394

LBXV07N - Blood Heptane (ng/mL)

Variable Name:
LBXV07N
SAS Label:
Blood Heptane (ng/mL)
English Text:
Blood Heptane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.071 to 0.767 Range of Values 2991 2991
. Missing 403 3394

LBDV07LC - Blood Heptane Comment Code

Variable Name:
LBDV07LC
SAS Label:
Blood Heptane Comment Code
English Text:
Blood Heptane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 34 34
1 Below lower detection limit 2957 2991
2 Detectable result and exceeds the calibrated range of assay 0 2991
. Missing 403 3394

LBXV08N - Blood Octane (ng/mL)

Variable Name:
LBXV08N
SAS Label:
Blood Octane (ng/mL)
English Text:
Blood Octane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.071 to 0.827 Range of Values 3000 3000
. Missing 394 3394

LBDV08LC - Blood Octane Comment Code

Variable Name:
LBDV08LC
SAS Label:
Blood Octane Comment Code
English Text:
Blood Octane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 5 5
1 Below lower detection limit 2995 3000
2 Detectable result and exceeds the calibrated range of assay 0 3000
. Missing 394 3394

LBXV1D - Blood 1,2-Dichlorobenzene (ng/mL)

Variable Name:
LBXV1D
SAS Label:
Blood 1,2-Dichlorobenzene (ng/mL)
English Text:
Blood 1,2-Dichlorobenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.018 to 0.092 Range of Values 3005 3005
. Missing 389 3394

LBDV1DLC - Blood 1,2-Dichlorobenzene Comment Code

Variable Name:
LBDV1DLC
SAS Label:
Blood 1,2-Dichlorobenzene Comment Code
English Text:
Blood 1,2-Dichlorobenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 1 1
1 Below lower detection limit 3004 3005
2 Detectable result and exceeds the calibrated range of assay 0 3005
. Missing 389 3394

LBXV2A - Blood 1,2-Dichloroethane (ng/mL)

Variable Name:
LBXV2A
SAS Label:
Blood 1,2-Dichloroethane (ng/mL)
English Text:
Blood 1,2-Dichloroethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.007 to 0.095 Range of Values 3035 3035
. Missing 359 3394

LBDV2ALC - Blood 1,2-Dichloroethane Comment Code

Variable Name:
LBDV2ALC
SAS Label:
Blood 1,2-Dichloroethane Comment Code
English Text:
Blood 1,2-Dichloroethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 99 99
1 Below lower detection limit 2936 3035
2 Detectable result and exceeds the calibrated range of assay 0 3035
. Missing 359 3394

LBXV3B - Blood 1,3-Dichlorobenzene (ng/mL)

Variable Name:
LBXV3B
SAS Label:
Blood 1,3-Dichlorobenzene (ng/mL)
English Text:
Blood 1,3-Dichlorobenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.018 to 0.018 Range of Values 3041 3041
. Missing 353 3394

LBDV3BLC - Blood 1,3-Dichlorobenzene Comment Code

Variable Name:
LBDV3BLC
SAS Label:
Blood 1,3-Dichlorobenzene Comment Code
English Text:
Blood 1,3-Dichlorobenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3041 3041
2 Detectable result and exceeds the calibrated range of assay 0 3041
. Missing 353 3394

LBXV4C - Blood Tetrachloroethene (ng/mL)

Variable Name:
LBXV4C
SAS Label:
Blood Tetrachloroethene (ng/mL)
English Text:
Blood Tetrachloroethene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.034 to 16 Range of Values 3089 3089
. Missing 305 3394

LBDV4CLC - Blood Tetrachloroethene Comment Code

Variable Name:
LBDV4CLC
SAS Label:
Blood Tetrachloroethene Comment Code
English Text:
Blood Tetrachloroethene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 189 189
1 Below lower detection limit 2900 3089
2 Detectable result and exceeds the calibrated range of assay 0 3089
. Missing 305 3394

LBXVBF - Blood Bromoform (ng/mL)

Variable Name:
LBXVBF
SAS Label:
Blood Bromoform (ng/mL)
English Text:
Blood Bromoform (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.006 to 0.139 Range of Values 3046 3046
. Missing 348 3394

LBDVBFLC - Blood Bromoform Comment Code

Variable Name:
LBDVBFLC
SAS Label:
Blood Bromoform Comment Code
English Text:
Blood Bromoform Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 259 259
1 Below lower detection limit 2787 3046
2 Detectable result and exceeds the calibrated range of assay 0 3046
. Missing 348 3394

LBXVBM - Blood Bromodichloromethane (ng/mL)

Variable Name:
LBXVBM
SAS Label:
Blood Bromodichloromethane (ng/mL)
English Text:
Blood Bromodichloromethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.004 to 0.068 Range of Values 3077 3077
. Missing 317 3394

LBDVBMLC - Blood Bromodichloromethane Comment Code

Variable Name:
LBDVBMLC
SAS Label:
Blood Bromodichloromethane Comment Code
English Text:
Blood Bromodichloromethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 513 513
1 Below lower detection limit 2564 3077
2 Detectable result and exceeds the calibrated range of assay 0 3077
. Missing 317 3394

LBXVBZ - Blood Benzene (ng/mL)

Variable Name:
LBXVBZ
SAS Label:
Blood Benzene (ng/mL)
English Text:
Blood Benzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.017 to 2.75 Range of Values 3038 3038
. Missing 356 3394

LBDVBZLC - Blood Benzene Comment Code

Variable Name:
LBDVBZLC
SAS Label:
Blood Benzene Comment Code
English Text:
Blood Benzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 1215 1215
1 Below lower detection limit 1823 3038
2 Detectable result and exceeds the calibrated range of assay 0 3038
. Missing 356 3394

LBXVBZN - Blood Benzonitrile (ng/mL)

Variable Name:
LBXVBZN
SAS Label:
Blood Benzonitrile (ng/mL)
English Text:
Blood Benzonitrile (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.106 to 1.92 Range of Values 3028 3028
. Missing 366 3394

LBDVZBLC - Blood Benzonitrile Comment Code

Variable Name:
LBDVZBLC
SAS Label:
Blood Benzonitrile Comment Code
English Text:
Blood Benzonitrile Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 167 167
1 Below lower detection limit 2861 3028
2 Detectable result and exceeds the calibrated range of assay 0 3028
. Missing 366 3394

LBXVC6 - Blood Cyclohexane (ng/mL)

Variable Name:
LBXVC6
SAS Label:
Blood Cyclohexane (ng/mL)
English Text:
Blood Cyclohexane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.014 to 12.7 Range of Values 2965 2965
. Missing 429 3394

LBDVC6LC - Blood Cyclohexane Comment Code

Variable Name:
LBDVC6LC
SAS Label:
Blood Cyclohexane Comment Code
English Text:
Blood Cyclohexane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 46 46
1 Below lower detection limit 2919 2965
2 Detectable result and exceeds the calibrated range of assay 0 2965
. Missing 429 3394

LBXVCB - Blood Chlorobenzene (ng/mL)

Variable Name:
LBXVCB
SAS Label:
Blood Chlorobenzene (ng/mL)
English Text:
Blood Chlorobenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.008 to 0.043 Range of Values 3070 3070
. Missing 324 3394

LBDVCBLC - Blood Chlorobenzene Comment Code

Variable Name:
LBDVCBLC
SAS Label:
Blood Chlorobenzene Comment Code
English Text:
Blood Chlorobenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 2 2
1 Below lower detection limit 3068 3070
2 Detectable result and exceeds the calibrated range of assay 0 3070
. Missing 324 3394

LBXVCF - Blood Chloroform (ng/mL)

Variable Name:
LBXVCF
SAS Label:
Blood Chloroform (ng/mL)
English Text:
Blood Chloroform (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.006 to 0.594 Range of Values 2989 2989
. Missing 405 3394

LBDVCFLC - Blood Chloroform Comment Code

Variable Name:
LBDVCFLC
SAS Label:
Blood Chloroform Comment Code
English Text:
Blood Chloroform Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 1696 1696
1 Below lower detection limit 1293 2989
2 Detectable result and exceeds the calibrated range of assay 0 2989
. Missing 405 3394

LBXVCM - Blood Dibromochloromethane (ng/mL)

Variable Name:
LBXVCM
SAS Label:
Blood Dibromochloromethane (ng/mL)
English Text:
Blood Dibromochloromethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.004 to 0.071 Range of Values 3087 3087
. Missing 307 3394

LBDVCMLC - Blood Dibromochloromethane Comment Code

Variable Name:
LBDVCMLC
SAS Label:
Blood Dibromochloromethane Comment Code
English Text:
Blood Dibromochloromethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 435 435
1 Below lower detection limit 2652 3087
2 Detectable result and exceeds the calibrated range of assay 0 3087
. Missing 307 3394

LBXVCT - Blood Carbon Tetrachloride (ng/mL)

Variable Name:
LBXVCT
SAS Label:
Blood Carbon Tetrachloride (ng/mL)
English Text:
Blood Carbon Tetrachloride (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.004 to 0.018 Range of Values 3067 3067
. Missing 327 3394

LBDVCTLC - Blood Carbon Tetrachloride Comment Code

Variable Name:
LBDVCTLC
SAS Label:
Blood Carbon Tetrachloride Comment Code
English Text:
Blood Carbon Tetrachloride Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 21 21
1 Below lower detection limit 3046 3067
2 Detectable result and exceeds the calibrated range of assay 0 3067
. Missing 327 3394

LBXVDB - Blood 1,4-Dichlorobenzene (ng/mL)

Variable Name:
LBXVDB
SAS Label:
Blood 1,4-Dichlorobenzene (ng/mL)
English Text:
Blood 1,4-Dichlorobenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 115 Range of Values 3067 3067
. Missing 327 3394

LBDVDBLC - Blood 1,4-Dichlorobenzene Comment Code

Variable Name:
LBDVDBLC
SAS Label:
Blood 1,4-Dichlorobenzene Comment Code
English Text:
Blood 1,4-Dichlorobenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 1658 1658
1 Below lower detection limit 1409 3067
2 Detectable result and exceeds the calibrated range of assay 0 3067
. Missing 327 3394

LBXVDE - Blood 1,2-Dibromoethane (ng/mL)

Variable Name:
LBXVDE
SAS Label:
Blood 1,2-Dibromoethane (ng/mL)
English Text:
Blood 1,2-Dibromoethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.011 0.011 2986 2986
. Missing 408 3394

LBDVDELC - Blood 1,2-Dibromoethane Comment Code

Variable Name:
LBDVDELC
SAS Label:
Blood 1,2-Dibromoethane Comment Code
English Text:
Blood 1,2-Dibromoethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 2986 2986
2 Detectable result and exceeds the calibrated range of assay 0 2986
. Missing 408 3394

LBXVDEE - Blood Diethyl Ether (ng/mL)

Variable Name:
LBXVDEE
SAS Label:
Blood Diethyl Ether (ng/mL)
English Text:
Blood Diethyl Ether (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 0.659 Range of Values 3029 3029
. Missing 365 3394

LBDVEELC - Blood Diethyl Ether Comment Code

Variable Name:
LBDVEELC
SAS Label:
Blood Diethyl Ether Comment Code
English Text:
Blood Diethyl Ether Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 7 7
1 Below lower detection limit 3022 3029
2 Detectable result and exceeds the calibrated range of assay 0 3029
. Missing 365 3394

LBXVDX - Blood 1,4-Dioxane (ng/mL)

Variable Name:
LBXVDX
SAS Label:
Blood 1,4-Dioxane (ng/mL)
English Text:
Blood 1,4-Dioxane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.354 to 0.354 Range of Values 2950 2950
. Missing 444 3394

LBDVDXLC - Blood 1,4-Dioxane Comment Code

Variable Name:
LBDVDXLC
SAS Label:
Blood 1,4-Dioxane Comment Code
English Text:
Blood 1,4-Dioxane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 2950 2950
2 Detectable result and exceeds the calibrated range of assay 0 2950
. Missing 444 3394

LBXVEA - Blood Ethyl Acetate (ng/mL)

Variable Name:
LBXVEA
SAS Label:
Blood Ethyl Acetate (ng/mL)
English Text:
Blood Ethyl Acetate (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.112 to 142 Range of Values 2965 2965
. Missing 429 3394

LBDVEALC - Blood Ethyl Acetate Comment Code

Variable Name:
LBDVEALC
SAS Label:
Blood Ethyl Acetate Comment Code
English Text:
Blood Ethyl Acetate Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 55 55
1 Below lower detection limit 2910 2965
2 Detectable result and exceeds the calibrated range of assay 0 2965
. Missing 429 3394

LBXVEB - Blood Ethylbenzene (ng/mL)

Variable Name:
LBXVEB
SAS Label:
Blood Ethylbenzene (ng/mL)
English Text:
Blood Ethylbenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.017 to 11.2 Range of Values 3059 3059
. Missing 335 3394

LBDVEBLC - Blood Ethylbenzene Comment Code

Variable Name:
LBDVEBLC
SAS Label:
Blood Ethylbenzene Comment Code
English Text:
Blood Ethylbenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 810 810
1 Below lower detection limit 2249 3059
2 Detectable result and exceeds the calibrated range of assay 0 3059
. Missing 335 3394

LBXVEC - Blood Chloroethane (ng/mL)

Variable Name:
LBXVEC
SAS Label:
Blood Chloroethane (ng/mL)
English Text:
Blood Chloroethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.032 to 0.505 Range of Values 3042 3042
. Missing 352 3394

LBDVECLC - Blood Chloroethane Comment Code

Variable Name:
LBDVECLC
SAS Label:
Blood Chloroethane Comment Code
English Text:
Blood Chloroethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 6 6
1 Below lower detection limit 3036 3042
2 Detectable result and exceeds the calibrated range of assay 0 3042
. Missing 352 3394

LBXVFN - Blood Furan (ng/mL)

Variable Name:
LBXVFN
SAS Label:
Blood Furan (ng/mL)
English Text:
Blood Furan (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.018 to 0.605 Range of Values 3089 3089
. Missing 305 3394

LBDVFNLC - Blood Furan Comment Code

Variable Name:
LBDVFNLC
SAS Label:
Blood Furan Comment Code
English Text:
Blood Furan Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 409 409
1 Below lower detection limit 2680 3089
2 Detectable result and exceeds the calibrated range of assay 0 3089
. Missing 305 3394

LBXVIBN - Blood Isobutyronitrile (ng/mL)

Variable Name:
LBXVIBN
SAS Label:
Blood Isobutyronitrile (ng/mL)
English Text:
Blood Isobutyronitrile (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 1.04 Range of Values 3008 3008
. Missing 386 3394

LBDVIBLC - Blood Isobutyronitrile Comment Code

Variable Name:
LBDVIBLC
SAS Label:
Blood Isobutyronitrile Comment Code
English Text:
Blood Isobutyronitrile Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 208 208
1 Below lower detection limit 2800 3008
2 Detectable result and exceeds the calibrated range of assay 0 3008
. Missing 386 3394

LBXVIPB - Blood Isopropylbenzene (ng/mL)

Variable Name:
LBXVIPB
SAS Label:
Blood Isopropylbenzene (ng/mL)
English Text:
Blood Isopropylbenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 0.051 Range of Values 3058 3058
. Missing 336 3394

LBDVIPLC - Blood Isopropylbenzene Comment Code

Variable Name:
LBDVIPLC
SAS Label:
Blood Isopropylbenzene Comment Code
English Text:
Blood Isopropylbenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 6 6
1 Below lower detection limit 3052 3058
2 Detectable result and exceeds the calibrated range of assay 0 3058
. Missing 336 3394

LBXVMC - Blood Methylene Chloride (ng/mL)

Variable Name:
LBXVMC
SAS Label:
Blood Methylene Chloride (ng/mL)
English Text:
Blood Methylene Chloride (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.177 to 32.8 Range of Values 3027 3027
. Missing 367 3394

LBDVMCLC - Blood Methylene Chloride Comment Code

Variable Name:
LBDVMCLC
SAS Label:
Blood Methylene Chloride Comment Code
English Text:
Blood Methylene Chloride Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 12 12
1 Below lower detection limit 3015 3027
2 Detectable result and exceeds the calibrated range of assay 0 3027
. Missing 367 3394

LBXVME - Blood MTBE (ng/mL)

Variable Name:
LBXVME
SAS Label:
Blood MTBE (ng/mL)
English Text:
Blood Methyl-tert-butyl ether (MTBE) (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.007 to 0.107 Range of Values 2858 2858
. Missing 536 3394

LBDVMELC - Blood MTBE Comment Code

Variable Name:
LBDVMELC
SAS Label:
Blood MTBE Comment Code
English Text:
Blood Methyl-tert-butyl ether (MTBE) Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 131 131
1 Below lower detection limit 2727 2858
2 Detectable result and exceeds the calibrated range of assay 0 2858
. Missing 536 3394

LBXVMCP - Blood Methylcyclopentane (ng/mL)

Variable Name:
LBXVMCP
SAS Label:
Blood Methylcyclopentane (ng/mL)
English Text:
Blood Methylcyclopentane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.014 to 33.1 Range of Values 2899 2899
. Missing 495 3394

LBDVMPLC - Blood Methylcyclopentane Comment Code

Variable Name:
LBDVMPLC
SAS Label:
Blood Methylcyclopentane Comment Code
English Text:
Blood Methylcyclopentane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 51 51
1 Below lower detection limit 2848 2899
2 Detectable result and exceeds the calibrated range of assay 0 2899
. Missing 495 3394

LBXVNB - Blood Nitrobenzene (ng/mL)

Variable Name:
LBXVNB
SAS Label:
Blood Nitrobenzene (ng/mL)
English Text:
Blood Nitrobenzene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.226 to 0.226 Range of Values 3037 3037
. Missing 357 3394

LBDVNBLC - Blood Nitrobenzene Comment Code

Variable Name:
LBDVNBLC
SAS Label:
Blood Nitrobenzene Comment Code
English Text:
Blood Nitrobenzene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3037 3037
2 Detectable result and exceeds the calibrated range of assay 0 3037
. Missing 357 3394

LBXVOX - Blood o-Xylene (ng/mL)

Variable Name:
LBXVOX
SAS Label:
Blood o-Xylene (ng/mL)
English Text:
Blood o-Xylene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.017 to 6.56 Range of Values 3065 3065
. Missing 329 3394

LBDVOXLC - Blood o-Xylene Comment Code

Variable Name:
LBDVOXLC
SAS Label:
Blood o-Xylene Comment Code
English Text:
Blood o-Xylene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 758 758
1 Below lower detection limit 2307 3065
2 Detectable result and exceeds the calibrated range of assay 0 3065
. Missing 329 3394

LBXVTC - Blood Trichloroethene (ng/mL)

Variable Name:
LBXVTC
SAS Label:
Blood Trichloroethene (ng/mL)
English Text:
Blood Trichloroethene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.008 to 0.15 Range of Values 3089 3089
. Missing 305 3394

LBDVTCLC - Blood Trichloroethene Comment Code

Variable Name:
LBDVTCLC
SAS Label:
Blood Trichloroethene Comment Code
English Text:
Blood Trichloroethene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 21 21
1 Below lower detection limit 3068 3089
2 Detectable result and exceeds the calibrated range of assay 0 3089
. Missing 305 3394

LBXVTE - Blood 1,1,1-Trichloroethane (ng/mL)

Variable Name:
LBXVTE
SAS Label:
Blood 1,1,1-Trichloroethane (ng/mL)
English Text:
Blood 1,1,1-Trichloroethane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.007 to 1.09 Range of Values 3079 3079
. Missing 315 3394

LBDVTELC - Blood 1,1,1-Trichloroethane Comment Code

Variable Name:
LBDVTELC
SAS Label:
Blood 1,1,1-Trichloroethane Comment Code
English Text:
Blood 1,1,1-Trichloroethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 21 21
1 Below lower detection limit 3058 3079
2 Detectable result and exceeds the calibrated range of assay 0 3079
. Missing 315 3394

LBXVTFT - Blood aaa-Trifluorotoluene (ng/mL)

Variable Name:
LBXVTFT
SAS Label:
Blood aaa-Trifluorotoluene (ng/mL)
English Text:
Blood aaa-Trifluorotoluene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 0.028 Range of Values 3077 3077
. Missing 317 3394

LBDVFTLC - Blood aaa-Trifluorotoluene Comment Code

Variable Name:
LBDVFTLC
SAS Label:
Blood aaa-Trifluorotoluene Comment Code
English Text:
Blood aaa-Trifluorotoluene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3077 3077
2 Detectable result and exceeds the calibrated range of assay 0 3077
. Missing 317 3394

LBXVTHF - Blood Tetrahydrofuran (ng/mL)

Variable Name:
LBXVTHF
SAS Label:
Blood Tetrahydrofuran (ng/mL)
English Text:
Blood Tetrahydrofuran (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.088 to 1.22 Range of Values 2979 2979
. Missing 415 3394

LBDVHTLC - Blood Tetrahydrofuran Comment Code

Variable Name:
LBDVHTLC
SAS Label:
Blood Tetrahydrofuran Comment Code
English Text:
Blood Tetrahydrofuran Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 17 17
1 Below lower detection limit 2962 2979
2 Detectable result and exceeds the calibrated range of assay 0 2979
. Missing 415 3394

LBXVTO - Blood Toluene (ng/mL)

Variable Name:
LBXVTO
SAS Label:
Blood Toluene (ng/mL)
English Text:
Blood Toluene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.018 to 11.5 Range of Values 3078 3078
. Missing 316 3394

LBDVTOLC - Blood Toluene Comment Code

Variable Name:
LBDVTOLC
SAS Label:
Blood Toluene Comment Code
English Text:
Blood Toluene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 2959 2959
1 Below lower detection limit 119 3078
2 Detectable result and exceeds the calibrated range of assay 0 3078
. Missing 316 3394

LBXVTP - Blood 1,2,3-Trichloropropane (ng/mL)

Variable Name:
LBXVTP
SAS Label:
Blood 1,2,3-Trichloropropane (ng/mL)
English Text:
Blood 1,2,3-Trichloropropane (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.028 to 0.028 Range of Values 3036 3036
. Missing 358 3394

LBDVTPLC - Blood 1,2,3-Trichloropropane Comt Code

Variable Name:
LBDVTPLC
SAS Label:
Blood 1,2,3-Trichloropropane Comt Code
English Text:
Blood 1,2,3-Trichloropropane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3036 3036
2 Detectable result and exceeds the calibrated range of assay 0 3036
. Missing 358 3394

LBXVVB - Blood Vinyl Bromide (ng/mL)

Variable Name:
LBXVVB
SAS Label:
Blood Vinyl Bromide (ng/mL)
English Text:
Blood Vinyl Bromide (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.032 to 0.032 Range of Values 3063 3063
. Missing 331 3394

LBDVVBLC - Blood Vinyl Bromide Comment Code

Variable Name:
LBDVVBLC
SAS Label:
Blood Vinyl Bromide Comment Code
English Text:
Blood Vinyl Bromide Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 0 0
1 Below lower detection limit 3063 3063
2 Detectable result and exceeds the calibrated range of assay 0 3063
. Missing 331 3394

LBXVXY - Blood m-/p-Xylene (ng/mL)

Variable Name:
LBXVXY
SAS Label:
Blood m-/p-Xylene (ng/mL)
English Text:
Blood m-/p-Xylene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.024 to 30.5 Range of Values 3085 3085
. Missing 309 3394

LBDVXYLC - Blood m-/p-Xylene Comment Code

Variable Name:
LBDVXYLC
SAS Label:
Blood m-/p-Xylene Comment Code
English Text:
Blood m-/p-Xylene Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above detection limit 1928 1928
1 Below lower detection limit 1157 3085
2 Detectable result and exceeds the calibrated range of assay 0 3085
. Missing 309 3394