• Component Description
• Eligible Sample
• Description of Laboratory Methodology
• Data Processing and Editing
• Laboratory Quality Assurance and Monitoring
• Codebook
  • SEQN - Respondent sequence number
  • URXPREG - Pregnancy test result

National Health and Nutrition Examination Survey

1999-2000 Data Documentation, Codebook, and Frequencies

Pregnancy Test - Urine (UC)

Data File: UC.xpt

First Published: June 2002

Last Revised: January 2007

Component Description

The urine pregnancy test was performed for females of ages 12-59 in 1999 and 8-59 in 2000. If the urine test results were positive for pregnancy, a serum pregnancy test was also performed.

Eligible Sample

The data file released to the public included female participants of ages 18 to 59 years old. Participants of ages 17 and younger were not included in the public data file because of confidentiality constrains.

Description of Laboratory Methodology

The Icon^r 25 hCG (Urine/Serum) test kit is a rapid chromatographic immunoassay for the qualitative detection of human chorionic gonadotropin (hCG) in urine or serum to aid in the early detection of pregnancy. The test utilizes a combination of monoclonal and polyclonal antibodies to selectively detect elevated levels of hCG in urine or serum.

Data Processing and Editing

Urine and serum specimens were tested in the NHANES mobile examination centers. Detailed specimen collection and processing instructions are discussed in the NHANES Laboratory/Medical Technologists Procedures Manual (LPM).

Laboratory Quality Assurance and Monitoring

The NHANES quality control and quality assurance protocols (QA/QC) meet the 1988 Clinical Laboratory Improvement Amendments mandates. Detailed quality control and quality assurance instructions are discussed in the NHANES Laboratory/Medical Technologists Procedures Manual (LPM). Read the LABDOC file for detailed QA/QC protocols.

Codebook and Frequencies