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HelpTest Code PSAFT Prostate-Specific Antigen (PSA), Total and Free, Serum
Ordering Guidance
This test may be ordered for patients undergoing evaluation of suspicion of prostate cancer, or for assessing the risk of prostate cancer in patients with borderline or moderately increased total prostate-specific antigen (4.0-10.0 ng/mL).
Necessary Information
Include patient's age.
Specimen Required
Supplies: Sarstedt Aliquot Tube 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial within 3 hours of collection.
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-General Request (T239)
-Oncology Test Request (T729)
Useful For
As an aid in distinguishing prostate cancer from benign prostatic conditions in men aged 50 years and older with total PSA between 4.0 and 10.0 ng/mL with digital rectal examination findings that are not suspicious for cancer
Method Name
Electrochemiluminescent Immunoassay (ECLIA)
Reporting Name
PSA Total and Free, SSpecimen Type
SerumSpecimen Minimum Volume
0.75 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Frozen (preferred) | 90 days | |
| Refrigerated | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | Reject |
Reference Values
TOTAL PROSTATE-SPECIFIC ANTIGEN (PSA)
Males:
|
Age (years) |
PSA upper limit (ng/mL) |
|
<40 |
≤2.0 |
|
40-49 |
≤2.5 |
|
50-59 |
≤3.5 |
|
60-69 |
≤4.5 |
|
70-79 |
≤6.5 |
|
≥80 |
≤7.2 |
Females: Not applicable
FREE PSA:TOTAL PSA
Males:
When Total PSA concentration is in the range of 4.0-10.0 ng/mL:
|
Probability of cancer |
|||
|
Free PSA/total PSA ratio |
50-59 years |
60-69 years |
≥70 years |
|
≤0.10 |
49% |
58% |
65% |
|
0.11-0.18 |
27% |
34% |
41% |
|
0.19-0.25 |
18% |
24% |
30% |
|
>0.25 |
9% |
12% |
16% |
Females: Not applicable
Report Available
1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Florida
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84153
84154
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| PSAFT | PSA Total and Free, S | 53764-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| TPSA | Total PSA | 83112-3 |
| FPSA | Free PSA | 83113-1 |
| PSA_R | Free PSA/PSA Ratio | 12841-3 |
Secondary ID
800066Day(s) Performed
Monday through Saturday
Testing Algorithm
Total prostate-specific antigen (PSA) and free PSA are performed and reported on every specimen.
If the initial total PSA concentration is between 4.0 and 10.0 ng/mL, then the percent free PSA result will be calculated and reported.