Table of Contents

Locator Record

Title: Urine Collection (Pregnancy) (UC )
Contact Number: 1-866-441-NCHS
Years of Content: 1999 - 2000
First Published: June, 2002
Revised: January, 2007
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Pregnancy Testing Using Urine and Blood Specimens
Record Source: NHANES 1999 - 2000
Survey Methodology: NHANES 1999 - 2000 is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files

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 Iconr 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 Act 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

SEQN - Respondent sequence number

Variable Name:
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Females only 18 YEARS - 59 YEARS

URXPREG - Pregnancy test result

Variable Name:
SAS Label:
Pregnancy test result
English Text:
Pregnancy test result
Females only 18 YEARS - 59 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 None 0 0
1 Positive 281 281
2 Negative 1519 1800
3 Not done 0 1800
4 Invalid 0 1800
. Missing 36 1836