Table of Contents

Locator Record

Title: Urine Pregnancy Test (UCPREG_E )
Contact Number: 1-866-441-NCHS
Years of Content: 2007 - 2008
First Published: September, 2009
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:A urine test was performed on survey participants 8 years and older.
Record Source: NHANES 2007 - 2008
Survey Methodology: NHANES 2007 - 2008 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

A urine test was performed on survey participants 8 years and older. If the urine pregnancy test was positive on any female participants aged 8 -17 years, the result was confirmed using a serum test. All positive test results excluded pregnant women from the DXA and cardiovascular fitness components of the mobile examination center.

Eligible Sample

A pregnancy test was completed on female participants aged 12–59 years and menstruating females aged 8–11 years. However, due to disclosure risks only females between 20 and 44 have urine pregnancy results in this file.

Description of Laboratory Methodology

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).

The Icon 25 hCG test kit (Beckman Coulter) 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.

A detailed description of the laboratory method used can be found on the NHANES website.

Data Processing and Editing

Instructions on data processing and editing can be found on the NHANES website.

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 General Documentation of Laboratory Data file for detailed QA/QC protocols.

A detailed description of the quality assurance and quality control procedures can be found on the NHANES website.

Analytic Notes

Exam sample weights should be used for analyses.

Please refer to the Analytic Guidelines for further details on the use of sample weights and other analytic issues. The Analytic Guidelines are available on the NHANES website.

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Females only 20 YEARS - 44 YEARS

URXPREG - Pregnancy test result

Variable Name:
URXPREG
SAS Label:
Pregnancy test result
English Text:
Pregnancy test result
Target:
Females only 20 YEARS - 44 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 57 57
2 Negative 1094 1151
3 Not done 28 1179
4 Invalid 0 1179
. Missing 1 1180