Prostate Specific Antigen, Free Percentage (Includes Free PSA and Total PSA)

0080206
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Abnormal
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Additional Technical Information

Ordering Recommendation

Do not use for initial prostate cancer screening; preferred test is Prostate Specific Antigen, Total (0070121) in conjunction with digital rectal exam (DRE). May provide additional prostate cancer risk information for patients with mildly elevated total PSA and a negative DRE.

Mnemonic

PSA FP

Methodology

Quantitative Electrochemiluminescent Immunoassay

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation
Collect

Serum separator tube or plasma separator tube. Also acceptable: Plain red, green (lithium heparin), lavender, or pink (K2EDTA).

Specimen Preparation

Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions

Grossly hemolyzed specimens. Vaginal washings.

Remarks
Stability

After separation from cells: Ambient: 8 hours; Refrigerated: 5 days; Frozen: 3 months

Reference Interval

By report
Results include: PSA-Free, PSA, PSA-Percent Free

Interpretive Data

The Roche PSA electrochemiluminescent immunoassay is used. Results obtained with different assay methods or kits cannot be used interchangeably. The Roche PSA method is approved for use as an aid in the detection of prostate cancer when used in conjunction with a digital rectal exam in men age 50 and older. The Roche Modular E170 PSA method is also indicated for the serial measurement of PSA to aid in the prognosis and management of prostate cancer patients.  Elevated PSA concentrations can only suggest the presence of prostate cancer until biopsy is performed. PSA concentrations can also be elevated in benign prostatic hyperplasia or inflammatory conditions of the prostate. PSA is generally not elevated in healthy men or men with non-prostatic carcinoma.
                                                                                    
ARUP uses the Roche Free PSA electrochemiluminescent immunoassay method in conjunction with the Roche PSA electrochemiluminescent immunoassay method to determine the free PSA percentage. The free PSA percentage is an aid in distinguishing prostate cancer from benign prostatic conditions in men age 50 and older with a total PSA between 3 and 10 ng/mL and negative digital rectal examination findings. Prostatic biopsy is required for the diagnosis of cancer. (Refer to: JAMA 1998; 279: 1542-1547)                                                                                                             


In patients with total PSA concentrations of 4-10 ng/mL, the probability of finding prostate cancer on needle biopsy by age in years is:
% Free PSA
 50-59 years
 60-69 years
 70 years and older
0-10% 49% 58% 65%
11-18% 27% 34% 41%
19-25% 18% 24% 30%
> 25 % 9% 12% 16%
Other factors may help determine the actual risk of prostate cancer in individual patients.

Compliance Category

FDA

Note

The free percentage is calculated using the total and free PSA results.

Hotline History

N/A

CPT Codes

84153; 84154

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Components

Component Test Code* Component Chart Name LOINC
0070121 Prostate Specific Antigen, Total 83112-3
0080207 Prostate Specific Antigen, Free 10886-0
0080209 Prostate Specific Antigen, Percent Free 12841-3
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Free Prostate Specific Antigen
  • Free PSA
  • PSA Free/Total Ratio
  • PSA ratio
  • PSA Total and Free
  • PSA, Free
  • Total PSA
Prostate Specific Antigen, Free Percentage (Includes Free PSA and Total PSA)