Table of Contents

Component Description

The analysis of individual plasma or serum fatty acids is important in the recognition of essential fatty acid deficiency (Siguel E. 1998) and in the differential diagnosis of inborn errors of metabolism, such as mitochondrial fatty acid oxidation disorders (Costa, et al. 1998; Jones, et al. 2000; Moser, et al. 1998). Long-chain polyunsaturated fatty acids are essential for normal development (Hamosh, et al. 1998). The dietary content of saturated, monounsaturated, and polyunsaturated fatty acids influence the concentration of cholesterol in low-density and high-density lipoproteins, and consequently the development of atherosclerosis (O’Keefe, et al. 1995). Regular consumption of or supplementation with omega-3 polyunsaturated fatty acids can have beneficial effects on long-term cardiovascular health due to anti-inflammatory and possibly antiarrhythmic effects (Kang, et al. 1996). The goal of this method is to obtain US reference ranges for most circulating fatty acids. Public health recommendations advise increasing or decreasing the intake of various classes of fatty acids (saturated, monounsaturated, polyunsaturated) but relatively little fatty acid biomarker data exist to support these recommendations and reference range data are scarce.

Eligible Sample

All examined participants aged 1 to 11 and participants aged 12 and over who were examined in the morning session were eligible.  

Description of Laboratory Methodology

Esterified fatty acids are hydrolyzed primarily from triglycerides, phospholipids and cholesteryl esters using sequential treatment with mineral acid and base in the presence of heat. Using a modification of (Lagerstedt, et al. 2001), total fatty acids are hexane-extracted from the matrix (100uL serum or plasma) along with an internal standard solution containing eighteen stable isotopically-labeled fatty acids to account for recovery.  The extract is derivatized with pentafluorobenzyl bromide (PFBBr) in the presence of triethylamine to form pentafluorobenzyl esters.  The reaction mixture is injected onto a capillary gas chromatograph column to resolve individual fatty acids of interest from other matrix constituents.  Fatty acids are detected using electron capture negative-ion mass spectrometry within 34 minutes.  Thirteen saturated, seven monounsaturated, and fifteen polyunsaturated fatty acids (thirty five fatty acids in total) are measured using selected ion monitoring.  Quantitation is accomplished by comparing the peak area of the analyte in the unknown with the peak area of a known amount in a calibrator solution.  Calculations are corrected based on the peak area of the internal standard in the unknown compared with the peak area of the internal standard in the calibrator solution. 

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 2011-2012 cycle.

Laboratory Method Files

Fatty Acids - Serum (January 2019)

Laboratory Quality Assurance and Monitoring

Serum samples were processed, stored and shipped to the Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA for testing. 

Detailed instructions on specimen collection and processing are discussed in the NHANES Laboratory Procedures Manual (LPM). Vials were stored under appropriate frozen (-30°C) conditions until they were 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 during “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 Sciences’ 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 2011-2012 Laboratory Data Overview for general information on NHANES laboratory data.

Subsample weights

Serum were measured in a full sample of 1 to 11 year olds and a fasting subsample of 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 2011-2012 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, length of fast, and the time of 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., LBDCAPLC) indicates whether the result was below the limit of detection: the value “0” means that the result was at or above the limit of detection, “1” indicates that the result was below the limit of detection. The other variable prefixed URX (ex., LBXCAP) provides the analytic result for that analyte. For analytes with analytic results below the lower limit of detection (ex., LBDCAPLC =1), an imputed fill value was placed in the analyte results field. This value is the lower limit of detection divided by the square root of 2 (LLOD/sqrt[2]).

The lower limit of detection (LLOD in µmol/L) for serum fatty acids: 

Variable Name

SAS Label

LLOD (µmol/L)

LBXCAP

Capric acid (C10:0) (µmol/L)

1.59

LBXLAR

Lauric acid (C12:0) (µmol/L)

2.33

LBXMR1

Myristic acid (14:0) (µmol/L)

4.90

LBXPEN

Pentadecanoic acid (C15:0) (µmol/L)

0.75

LBXPM1

Palmitic acid (16:0) (µmol/L)

78.1

LBXMRG

Margaric acid (C17:0) (µmol/L)

3.36

LBXST1

Stearic acid (18:0) (µmol/L)

39.1

LBXAR1

Arachidic acid (20:0) (µmol/L)

0.82

LBXDA1

Docosanoic acid (22:0) (µmol/L)

0.68

LBXTSA

Tricosanoic acid (C23:0) (µmol/L)

0.90

LBXLG1

Lignoceric acid (24:0) (µmol/L)

1.09

LBXML1

Myristoleic acid (14:1n-5) (µmol/L)

0.29

LBXPL1

Palmitoleic acid (16:1n-7) (µmol/L)

6.56

LBXVC1

cis-Vaccenic acid (18:1n-7) (µmol/L)

2.31

LBXOL1

Oleic acid (18:1n-9) (µmol/L)

17.7

LBXEN1

Eicosenoic acid (20:1n-9) (µmol/L)

0.87

LBXNR1

Nervonic acid (24:1n-9) (µmol/L)

0.69

LBXLNA

Linoleic acid (18:2n-6) (µmol/L)

22.6

LBXALN

alpha-Linolenic acid (18:3n-3) (µmol/L)

1.54

LBXGLA

gamma-Linolenic acid (18:3n-6) (µmol/L)

0.42

LBXSD1

Stearidonic acid (C18:4n-3) (µmol/L)

0.24

LBXED1

Eicosadienoic acid (20:2n-6) (µmol/L)

0.31

LBXHGL

homo-gamma-Linolenic acid(20:3n-6)(µM/L)

1.14

LBXET1

Eicosatrienoic acid (C20:3n-9) (µmol/L)

0.39

LBXARA

Arachidonic acid (20:4n-6) (µmol/L)

7.34

LBXEPA

Eicosapentaenoic acid (20:5n-3) (µmol/L)

0.79

LBXDTA

Docosatetraenoic acid (22:4n-6) (µmol/L)

0.31

LBXDP3

Docosapentaenoic acid (22:5n-3) (µmol/L)

0.55

LBXDP6

Docosapentaenoic acid (22:5n-6) (µmol/L)

0.24

LBXDHA

Docosahexaenoic acid (22:6n-3) (µmol/L)

1.84

 

Previous survey cycles provided limited information on selected fatty acids. Plasma fatty acids were measured in NHANES 2003-2004 as part of a surplus specimen project. Please see the NHANES web site for descriptions of the 2003-2004 surplus specimen fatty acid data.

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 1 YEARS - 150 YEARS

WTFAS2YR - Fatty Acid Subsample 2 Year Weight

Variable Name:
WTFAS2YR
SAS Label:
Fatty Acid Subsample 2 Year Weight
English Text:
Fatty Acid Subsample 2 Year Weight
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 521033.37059 Range of Values 5643 5643
. Missing 0 5643

LBXCAP - Capric acid (C10:0) (umol/L)

Variable Name:
LBXCAP
SAS Label:
Capric acid (C10:0) (umol/L)
English Text:
Capric acid (C10:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.12 to 113 Range of Values 3873 3873
. Missing 1770 5643

LBDCAPLC - Capric acid (C10:0) comment code

Variable Name:
LBDCAPLC
SAS Label:
Capric acid (C10:0) comment code
English Text:
Capric acid (C10:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 2011 2011
1 Below lower detection limit 1862 3873
. Missing 1770 5643

LBXLAR - Lauric acid (C12:0) (umol/L)

Variable Name:
LBXLAR
SAS Label:
Lauric acid (C12:0) (umol/L)
English Text:
Lauric acid (C12:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.65 to 781 Range of Values 4249 4249
. Missing 1394 5643

LBDLARLC - Lauric acid (C12:0) comment code

Variable Name:
LBDLARLC
SAS Label:
Lauric acid (C12:0) comment code
English Text:
Lauric acid (C12:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4080 4080
1 Below lower detection limit 169 4249
. Missing 1394 5643

LBXMR1 - Myristic acid (14:0) (umol/L)

Variable Name:
LBXMR1
SAS Label:
Myristic acid (14:0) (umol/L)
English Text:
Myristic acid (14:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
15 to 1880 Range of Values 4417 4417
. Missing 1226 5643

LBDMR1LC - Myristic acid (14:0) comment code

Variable Name:
LBDMR1LC
SAS Label:
Myristic acid (14:0) comment code
English Text:
Myristic acid (14:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4417 4417
1 Below lower detection limit 0 4417
. Missing 1226 5643

LBXPEN - Pentadecanoic acid (C15:0) (umol/L)

Variable Name:
LBXPEN
SAS Label:
Pentadecanoic acid (C15:0) (umol/L)
English Text:
Pentadecanoic acid (C15:0) (�mol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.64 to 150 Range of Values 4401 4401
. Missing 1242 5643

LBDPENLC - Pentadecanoic acid (C15:0) comment code

Variable Name:
LBDPENLC
SAS Label:
Pentadecanoic acid (C15:0) comment code
English Text:
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4401 4401
1 Below lower detection limit 0 4401
. Missing 1242 5643

LBXPM1 - Palmitic acid (16:0) (umol/L)

Variable Name:
LBXPM1
SAS Label:
Palmitic acid (16:0) (umol/L)
English Text:
Palmitic acid (16:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
950 to 16500 Range of Values 4415 4415
. Missing 1228 5643

LBDPM1LC - Palmitic acid (16:0) comment code

Variable Name:
LBDPM1LC
SAS Label:
Palmitic acid (16:0) comment code
English Text:
Palmitic acid (16:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4415 4415
1 Below lower detection limit 0 4415
. Missing 1228 5643

LBXMRG - Margaric acid (C17:0) (umol/L)

Variable Name:
LBXMRG
SAS Label:
Margaric acid (C17:0) (umol/L)
English Text:
Margaric acid (C17:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11.2 to 139 Range of Values 4355 4355
. Missing 1288 5643

LBDMRGLC - Margaric acid (C17:0) comment code

Variable Name:
LBDMRGLC
SAS Label:
Margaric acid (C17:0) comment code
English Text:
Margaric acid (C17:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4355 4355
1 Below lower detection limit 0 4355
. Missing 1288 5643

LBXST1 - Stearic acid (18:0) (umol/L)

Variable Name:
LBXST1
SAS Label:
Stearic acid (18:0) (umol/L)
English Text:
Stearic acid (18:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
220 to 3300 Range of Values 4420 4420
. Missing 1223 5643

LBDST1LC - Stearic acid (18:0) comment code

Variable Name:
LBDST1LC
SAS Label:
Stearic acid (18:0) comment code
English Text:
Stearic acid (18:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4420 4420
1 Below lower detection limit 0 4420
. Missing 1223 5643

LBXAR1 - Arachidic acid (20:0) (umol/L)

Variable Name:
LBXAR1
SAS Label:
Arachidic acid (20:0) (umol/L)
English Text:
Arachidic acid (20:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
10.5 to 111 Range of Values 4226 4226
. Missing 1417 5643

LBDAR1LC - Arachidic acid (20:0) comment code

Variable Name:
LBDAR1LC
SAS Label:
Arachidic acid (20:0) comment code
English Text:
Arachidic acid (20:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4226 4226
1 Below lower detection limit 0 4226
. Missing 1417 5643

LBXDA1 - Docosanoic acid (22:0) (umol/L)

Variable Name:
LBXDA1
SAS Label:
Docosanoic acid (22:0) (umol/L)
English Text:
Docosanoic acid (22:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
24.5 to 197 Range of Values 4378 4378
. Missing 1265 5643

LBDDA1LC - Docosanoic acid (22:0) comment code

Variable Name:
LBDDA1LC
SAS Label:
Docosanoic acid (22:0) comment code
English Text:
Docosanoic acid (22:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4378 4378
1 Below lower detection limit 0 4378
. Missing 1265 5643

LBXTSA - Tricosanoic acid (C23:0) (umol/L)

Variable Name:
LBXTSA
SAS Label:
Tricosanoic acid (C23:0) (umol/L)
English Text:
Tricosanoic acid (C23:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
9.77 to 60.2 Range of Values 4266 4266
. Missing 1377 5643

LBDTSALC - Tricosanoic acid (C23:0) comment code

Variable Name:
LBDTSALC
SAS Label:
Tricosanoic acid (C23:0) comment code
English Text:
Tricosanoic acid (C23:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4266 4266
1 Below lower detection limit 0 4266
. Missing 1377 5643

LBXLG1 - Lignoceric acid (24:0) (umol/L)

Variable Name:
LBXLG1
SAS Label:
Lignoceric acid (24:0) (umol/L)
English Text:
Lignoceric acid (24:0) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
19.8 to 158 Range of Values 4394 4394
. Missing 1249 5643

LBDLG1LC - Lignoceric acid (24:0) comment code

Variable Name:
LBDLG1LC
SAS Label:
Lignoceric acid (24:0) comment code
English Text:
Lignoceric acid (24:0) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4394 4394
1 Below lower detection limit 0 4394
. Missing 1249 5643

LBXML1 - Myristoleic acid (14:1n-5) (umol/L)

Variable Name:
LBXML1
SAS Label:
Myristoleic acid (14:1n-5) (umol/L)
English Text:
Myristoleic acid (14:1n-5) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.21 to 241 Range of Values 3911 3911
. Missing 1732 5643

LBDML1LC - Myristoleic acid (14:1n-5) comment code

Variable Name:
LBDML1LC
SAS Label:
Myristoleic acid (14:1n-5) comment code
English Text:
Myristoleic acid (14:1n-5) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 3910 3910
1 Below lower detection limit 1 3911
. Missing 1732 5643

LBXPL1 - Palmitoleic acid (16:1n-7) (umol/L)

Variable Name:
LBXPL1
SAS Label:
Palmitoleic acid (16:1n-7) (umol/L)
English Text:
Palmitoleic acid (16:1n-7) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
31 to 4730 Range of Values 4348 4348
. Missing 1295 5643

LBDPL1LC - Palmitoleic acid (16:1n-7) comment code

Variable Name:
LBDPL1LC
SAS Label:
Palmitoleic acid (16:1n-7) comment code
English Text:
Palmitoleic acid (16:1n-7) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4348 4348
1 Below lower detection limit 0 4348
. Missing 1295 5643

LBXVC1 - cis-Vaccenic acid (18:1n-7) (umol/L)

Variable Name:
LBXVC1
SAS Label:
cis-Vaccenic acid (18:1n-7) (umol/L)
English Text:
cis-Vaccenic acid (18:1n-7) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
43.2 to 1330 Range of Values 4343 4343
. Missing 1300 5643

LBDVC1LC - cis-Vaccenic acid (18:1n-7) comment code

Variable Name:
LBDVC1LC
SAS Label:
cis-Vaccenic acid (18:1n-7) comment code
English Text:
cis-Vaccenic acid (18:1n-7) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4343 4343
1 Below lower detection limit 0 4343
. Missing 1300 5643

LBXOL1 - Oleic acid (18:1n-9) (umol/L)

Variable Name:
LBXOL1
SAS Label:
Oleic acid (18:1n-9) (umol/L)
English Text:
Oleic acid (18:1n-9) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
707 to 20900 Range of Values 4405 4405
. Missing 1238 5643

LBDOL1LC - Oleic acid (18:1n-9) comment code

Variable Name:
LBDOL1LC
SAS Label:
Oleic acid (18:1n-9) comment code
English Text:
Oleic acid (18:1n-9) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4405 4405
1 Below lower detection limit 0 4405
. Missing 1238 5643

LBXEN1 - Eicosenoic acid (20:1n-9) (umol/L)

Variable Name:
LBXEN1
SAS Label:
Eicosenoic acid (20:1n-9) (umol/L)
English Text:
Eicosenoic acid (20:1n-9) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.42 to 136 Range of Values 4029 4029
. Missing 1614 5643

LBDEN1LC - Eicosenoic acid (20:1n-9) comment code

Variable Name:
LBDEN1LC
SAS Label:
Eicosenoic acid (20:1n-9) comment code
English Text:
Eicosenoic acid (20:1n-9) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4029 4029
1 Below lower detection limit 0 4029
. Missing 1614 5643

LBXNR1 - Nervonic acid (24:1n-9) (umol/L)

Variable Name:
LBXNR1
SAS Label:
Nervonic acid (24:1n-9) (umol/L)
English Text:
Nervonic acid (24:1n-9) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
31.1 to 215 Range of Values 4025 4025
. Missing 1618 5643

LBDNR1LC - Nervonic acid (24:1n-9) comment code

Variable Name:
LBDNR1LC
SAS Label:
Nervonic acid (24:1n-9) comment code
English Text:
Nervonic acid (24:1n-9) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4025 4025
1 Below lower detection limit 0 4025
. Missing 1618 5643

LBXLNA - Linoleic acid (18:2n-6) (umol/L)

Variable Name:
LBXLNA
SAS Label:
Linoleic acid (18:2n-6) (umol/L)
English Text:
Linoleic acid (18:2n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1370 to 15900 Range of Values 4407 4407
. Missing 1236 5643

LBDLNALC - Linoleic acid (18:2n-6) comment code

Variable Name:
LBDLNALC
SAS Label:
Linoleic acid (18:2n-6) comment code
English Text:
Linoleic acid (18:2n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4407 4407
1 Below lower detection limit 0 4407
. Missing 1236 5643

LBXALN - alpha-Linolenic acid (18:3n-3) (umol/L)

Variable Name:
LBXALN
SAS Label:
alpha-Linolenic acid (18:3n-3) (umol/L)
English Text:
alpha-Linolenic acid (18:3n-3) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
15.2 to 803 Range of Values 4405 4405
. Missing 1238 5643

LBDALNLC - alpha-Linolenic acid (18:3n-3) cmnt code

Variable Name:
LBDALNLC
SAS Label:
alpha-Linolenic acid (18:3n-3) cmnt code
English Text:
alpha-Linolenic acid (18:3n-3) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4405 4405
1 Below lower detection limit 0 4405
. Missing 1238 5643

LBXGLA - gamma-Linolenic acid (18:3n-6) (umol/L)

Variable Name:
LBXGLA
SAS Label:
gamma-Linolenic acid (18:3n-6) (umol/L)
English Text:
gamma-Linolenic acid (18:3n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5.17 to 391 Range of Values 4312 4312
. Missing 1331 5643

LBDGLALC - gamma-Linolenic acid (18:3n-6) cmnt code

Variable Name:
LBDGLALC
SAS Label:
gamma-Linolenic acid (18:3n-6) cmnt code
English Text:
gamma-Linolenic acid (18:3n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4312 4312
1 Below lower detection limit 0 4312
. Missing 1331 5643

LBXSD1 - Stearidonic acid (C18:4n-3) (umol/L)

Variable Name:
LBXSD1
SAS Label:
Stearidonic acid (C18:4n-3) (umol/L)
English Text:
Stearidonic acid (C18:4n-3) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.17 to 104 Range of Values 3866 3866
. Missing 1777 5643

LBDSD1LC - Stearidonic acid (C18:4n-3) comment code

Variable Name:
LBDSD1LC
SAS Label:
Stearidonic acid (C18:4n-3) comment code
English Text:
Stearidonic acid (C18:4n-3) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 3837 3837
1 Below lower detection limit 29 3866
. Missing 1777 5643

LBXED1 - Eicosadienoic acid (20:2n-6) (umol/L)

Variable Name:
LBXED1
SAS Label:
Eicosadienoic acid (20:2n-6) (umol/L)
English Text:
Eicosadienoic acid (20:2n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
6.4 to 134 Range of Values 3974 3974
. Missing 1669 5643

LBDED1LC - Eicosadienoic acid (20:2n-6) comnt code

Variable Name:
LBDED1LC
SAS Label:
Eicosadienoic acid (20:2n-6) comnt code
English Text:
Eicosadienoic acid (20:2n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 3974 3974
1 Below lower detection limit 0 3974
. Missing 1669 5643

LBXHGL - homo-gamma-Linolenic acid(20:3n-6)(uM/L)

Variable Name:
LBXHGL
SAS Label:
homo-gamma-Linolenic acid(20:3n-6)(uM/L)
English Text:
homo-gamma-Linolenic acid (20:3n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
29 to 465 Range of Values 4182 4182
. Missing 1461 5643

LBDHGLLC - homo-gamma-Linolenic acd (C20:3n-6)cmnt

Variable Name:
LBDHGLLC
SAS Label:
homo-gamma-Linolenic acd (C20:3n-6)cmnt
English Text:
homo-gamma-Linolenic acid (20:3n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4182 4182
1 Below lower detection limit 0 4182
. Missing 1461 5643

LBXET1 - Eicosatrienoic acid (C20:3n-9) (umol/L)

Variable Name:
LBXET1
SAS Label:
Eicosatrienoic acid (C20:3n-9) (umol/L)
English Text:
Eicosatrienoic acid (C20:3n-9) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.28 to 85.3 Range of Values 3782 3782
. Missing 1861 5643

LBDET1LC - Eicosatrienoic acid (C20:3n-9) comt code

Variable Name:
LBDET1LC
SAS Label:
Eicosatrienoic acid (C20:3n-9) comt code
English Text:
Eicosatrienoic acid (C20:3n-9) comment code
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 3776 3776
1 Below lower detection limit 6 3782
. Missing 1861 5643

LBXARA - Arachidonic acid (20:4n-6) (umol/L)

Variable Name:
LBXARA
SAS Label:
Arachidonic acid (20:4n-6) (umol/L)
English Text:
Arachidonic acid (20:4n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
187 to 2670 Range of Values 4418 4418
. Missing 1225 5643

LBDARALC - Arachidonic acid (20:4n-6) comment code

Variable Name:
LBDARALC
SAS Label:
Arachidonic acid (20:4n-6) comment code
English Text:
Arachidonic acid (20:4n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4418 4418
1 Below lower detection limit 0 4418
. Missing 1225 5643

LBXEPA - Eicosapentaenoic acid (20:5n-3) (umol/L)

Variable Name:
LBXEPA
SAS Label:
Eicosapentaenoic acid (20:5n-3) (umol/L)
English Text:
Eicosapentaenoic acid (20:5n-3) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.56 to 1090 Range of Values 4421 4421
. Missing 1222 5643

LBDEPALC - Eicosapentaenoic acid (20:5n-3) cmt code

Variable Name:
LBDEPALC
SAS Label:
Eicosapentaenoic acid (20:5n-3) cmt code
English Text:
Eicosapentaenoic acid (20:5n-3) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4420 4420
1 Below lower detection limit 1 4421
. Missing 1222 5643

LBXDTA - Docosatetraenoic acid (22:4n-6) (umol/L)

Variable Name:
LBXDTA
SAS Label:
Docosatetraenoic acid (22:4n-6) (umol/L)
English Text:
Docosatetraenoic acid (22:4n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.71 to 204 Range of Values 4259 4259
. Missing 1384 5643

LBDDTALC - Docosatetraenoic acid (22:4n-6) cmt code

Variable Name:
LBDDTALC
SAS Label:
Docosatetraenoic acid (22:4n-6) cmt code
English Text:
Docosatetraenoic acid (22:4n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4259 4259
1 Below lower detection limit 0 4259
. Missing 1384 5643

LBXDP3 - Docosapentaenoic acid (22:5n-3) (umol/L)

Variable Name:
LBXDP3
SAS Label:
Docosapentaenoic acid (22:5n-3) (umol/L)
English Text:
Docosapentaenoic acid (22:5n-3) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
12.6 to 229 Range of Values 4305 4305
. Missing 1338 5643

LBDDP3LC - Docosapentaenoic acid (22:5n-3) cmt code

Variable Name:
LBDDP3LC
SAS Label:
Docosapentaenoic acid (22:5n-3) cmt code
English Text:
Docosapentaenoic acid (22:5n-3) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4305 4305
1 Below lower detection limit 0 4305
. Missing 1338 5643

LBXDP6 - Docosapentaenoic acid (22:5n-6) (umol/L)

Variable Name:
LBXDP6
SAS Label:
Docosapentaenoic acid (22:5n-6) (umol/L)
English Text:
Docosapentaenoic acid (22:5n-6) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.18 to 126 Range of Values 4274 4274
. Missing 1369 5643

LBDDP6LC - Docosapentaenoic acid (22:5n-6) cmt code

Variable Name:
LBDDP6LC
SAS Label:
Docosapentaenoic acid (22:5n-6) cmt code
English Text:
Docosapentaenoic acid (22:5n-6) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4274 4274
1 Below lower detection limit 0 4274
. Missing 1369 5643

LBXDHA - Docosahexaenoic acid (22:6n-3) (umol/L)

Variable Name:
LBXDHA
SAS Label:
Docosahexaenoic acid (22:6n-3) (umol/L)
English Text:
Docosahexaenoic acid (22:6n-3) (umol/L)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
25.7 to 918 Range of Values 4405 4405
. Missing 1238 5643

LBDDHALC - Docosahexaenoic acid (22:6n-3) cmnt code

Variable Name:
LBDDHALC
SAS Label:
Docosahexaenoic acid (22:6n-3) cmnt code
English Text:
Docosahexaenoic acid (22:6n-3) comment code
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 4405 4405
1 Below lower detection limit 0 4405
. Missing 1238 5643