Table of Contents

Locator Record

Title: Prostate specific antigen (PSA) (L11PSA_B )
Contact Number: 1-866-441-NCHS
Years of Content: 2001 - 2002
First Published: April, 2004
Revised: May, 2004
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Prostate specific antigen (PSA)
Record Source: NHANES 2001 - 2002
Survey Methodology: NHANES 2001 - 2002 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

Total and free prostate specific antigens (PSA) were measured among men age 40 years and older. PSA exclusion questions (KIQ115, KIQ185, KIQ190, KIQ195, KIQ201, KIQ241, KIQ281, KIQ301, and KIQ311) were asked during the physician’s examination. PSA immunoassay was performed on blood specimens using the Hybritech tests (Beckman Coulter, Fullerton, CA).

Eligible Sample

Male participants aged 40 years and older were tested for PSA. Those who reported having any of the following conditions were not eligible for PSA testing:

Description of Laboratory Methodology

Free prostate specific antigen

The Access Hybritech free PSA assay is a two-site immunoenzymatic "sandwich" assay. A sample was added to a reaction vessel with mouse monoclonal anti-free PSA alkaline phosphatase conjugate, and paramagnetic particles coated with a second mouse monoclonal anti-free PSA antibody. The free PSA in the sample bound to the immobilized monoclonal anti-free PSA on the solid phase while, at the same time, the monoclonal anti-PSA conjugate reacted with a different antigenic site on the sample free PSA. Separation in a magnetic field and washing removes material not bound to the solid phase. A chemiluminescent substrate, Lumi-Phostm 530 was added to the reaction vessel and light generated by the reaction was measured with a luminometer. The light production was proportional to the concentration of free PSA in the sample. The amount of analyte in the sample was determined by means of a stored, multi-point calibration curve.

Total prostate specific antigen

Total PSA values were obtained using the Hybritech PSA method on the Beckman Access. A second sample was added to a reaction vessel with mouse monoclonal anti-PSA alkaline phosphatase conjugate and paramagnetic particles coated with a second mouse monoclonal anti-PSA antibody. The PSA in the sample bound to the immobilized monoclonal anti-PSA on the solid phase while, at the same time, the monoclonal anti-PSA conjugate reacted with a different antigenic site on the sample PSA. The light production was proportional to the concentration of PSA in the sample.

Prostate specific antigen ratio

This ratio was calculated by dividing the free PSA by the total PSA:

LBDP3 = round ((LBXP2/LBXP1)*100)

Data Processing and Editing

Blood specimens are processed, stored and shipped to University of Washington, Seattle, Washington. Detailed specimen collection and processing instructions are discussed in the NHANES Laboratory/Medical Technologists Procedures Manual (LPM). Read the LABDOC file for detailed data processing and editing protocols. The analytical methods are described in the Analytic methodology section.

Analytic Notes

The analysis of NHANES 2001-2002 laboratory data must be conducted with the key survey design and basic demographic variables. The NHANES 2001-2002 Questionnaire Data Files contain demographic data, health indicators, and other related information collected during household interview and MEC examination. They also contain sample weights for these age groups. The phlebotomy file includes auxiliary information such the conditions precluding venipuncture. The household questionnaire and phlebotomy files may be linked to the laboratory data file using the unique survey participant identifier SEQN.

Data on health conditions that would make a sample person ineligible for PSA testing are missing for some people (n=60) with non-missing PSA lab data. This happened mainly because some sample persons did not attend the physician’s examination component of the MEC examination where such data were collected. It is advisable to exclude these observations for PSA analyses.

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Males only 40 YEARS - 150 YEARS

KIQ110 - Willing to have blood tested for PSA

Variable Name:
KIQ110
SAS Label:
Willing to have blood tested for PSA
English Text:
Are you willing to have your blood tested for PSA?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1470 1470
2 No 42 1512 End of Section
. Missing 89 1601

KIQ115 - Infection or inflammation of prostate

Variable Name:
KIQ115
SAS Label:
Infection or inflammation of prostate
English Text:
{Do you/does SP} have an infection or inflammation of the prostate gland at the present time?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 20 20
2 No 1436 1456
7 Refused 0 1456
9 Don't know 13 1469
. Missing 132 1601

KIQ185 - Rectal exam in the last 7 days

Variable Name:
KIQ185
SAS Label:
Rectal exam in the last 7 days
English Text:
{Have you/Has SP} had a rectal exam in the last 7 days?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 26 26
2 No 1443 1469
7 Refused 0 1469
9 Don't know 0 1469
. Missing 132 1601

KIQ190 - Prostate biopsy in the last 4 weeks

Variable Name:
KIQ190
SAS Label:
Prostate biopsy in the last 4 weeks
English Text:
{Have you/Has SP} had a prostate biopsy in the last 4 weeks?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 8 8
2 No 1461 1469
7 Refused 0 1469
9 Don't know 0 1469
. Missing 132 1601

KIQ195 - Cystoscopy in the last 4 weeks

Variable Name:
KIQ195
SAS Label:
Cystoscopy in the last 4 weeks
English Text:
{Have you/Has SP} had a cystoscopy in the last 4 weeks? (Cystoscopy is an internal examination of the prostate and bladder using a flexible tube-like instrument with a lens inserted through the penis.)
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 8 8
2 No 1461 1469
7 Refused 0 1469
9 Don't know 0 1469
. Missing 132 1601

KIQ201 - Diagnosed with prostate cancer

Variable Name:
KIQ201
SAS Label:
Diagnosed with prostate cancer
English Text:
{Have you/Has SP} ever been told by a doctor or health professional that {you/he} had prostate cancer?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 63 63
2 No 1405 1468 End of Section
7 Refused 0 1468 End of Section
9 Don't know 1 1469 End of Section
. Missing 132 1601

KIQ221 - Age at diagnosis of prostate cancer

Variable Name:
KIQ221
SAS Label:
Age at diagnosis of prostate cancer
English Text:
How old {were you/was SP} when {you were/he was} first told that {you/he} had prostate cancer?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
39 to 88 Range of Values 54 54
777 Refused 0 54
999 Don't know 0 54
. Missing 1547 1601

KIQ241 - Ever had prostate surgery

Variable Name:
KIQ241
SAS Label:
Ever had prostate surgery
English Text:
{Have you/Has SP} ever had surgery on {your/his} prostate?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 36 36
2 No 27 63 KIQ301
7 Refused 0 63 KIQ301
9 Don't know 0 63 KIQ301
. Missing 1538 1601

KIQ281 - Was surgery for prostate cancer?

Variable Name:
KIQ281
SAS Label:
Was surgery for prostate cancer?
English Text:
Was the surgery for cancer of the prostate gland?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 36 36
2 No 0 36
7 Refused 0 36
9 Don't know 0 36
. Missing 1565 1601

KIQ301 - Radiation treatment for prostate cancer

Variable Name:
KIQ301
SAS Label:
Radiation treatment for prostate cancer
English Text:
{Have you/Has SP} ever had radiation treatments for prostate cancer?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 26 26
2 No 36 62
7 Refused 0 62
9 Don't know 1 63
. Missing 1538 1601

KIQ311 - Taken medicines for prostate cancer

Variable Name:
KIQ311
SAS Label:
Taken medicines for prostate cancer
English Text:
{Have you/Has SP} ever taken prescribed medicines for prostate cancer?
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 21 21
2 No 41 62
7 Refused 0 62
9 Don't know 1 63
. Missing 1538 1601

LBXP1 - PSA. total (ng/mL)

Variable Name:
LBXP1
SAS Label:
PSA. total (ng/mL)
English Text:
Prostate specific antigen, total (ng/mL)
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1 to 202 Range of Values 1380 1380
. Missing 221 1601

LBXP2 - PSA, free (ng/mL)

Variable Name:
LBXP2
SAS Label:
PSA, free (ng/mL)
English Text:
Prostate specific antigen (PSA), free (ng/mL)
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.04 to 25.3 Range of Values 1380 1380
. Missing 221 1601

LBDP3 - Prostate specific antigen ratio (%)

Variable Name:
LBDP3
SAS Label:
Prostate specific antigen ratio (%)
English Text:
Prostate specific antigen ratio (%)
Target:
Males only 40 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4 to 95 Range of Values 1380 1380
. Missing 221 1601