Test Overview
Test Methodology

Electrochemiluminescent Immunoassay (ECLIA)

Test Usage

The percentage of measured PSA existing in the free form (free:total PSA ratio) is useful in assessing the risk of prostate cancer in patients with borderline or moderately increased total PSA (4-10 ng/mL).

Reference Range *

When total PSA is in the range of 4.0-10.0 ng/mL, a free:total PSA ratio < or =0.10 indicates 49% to 65% risk of prostate cancer depending on age; a free:total PSA ratio >0.25 indicates a 9% to 16% risk of prostate cancer, depending on age.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

1 - 5 days

Soft Order Code
PSAFT
MiChart Code
PSA, Total and Free (Sendout)
Synonyms
  • PSAR
  • PSA, TOTAL/FREE/RATIO
  • Free PSA Ratio
  • PSA, Free
  • PSAFT
  • PSA Total and Free, S
Laboratory
Sendout
Reference Laboratory
Mayo PSAFT (81944)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in an SST or red top tube. Centrifuge, aliquot serum into plastic vial within 3 hours of collection and freeze. Transport to MLabs as a frozen aliquot.

Contraindications
Should only be collected on patients with a total PSA of between 4.0 and 10.0 ng./mL
Yellow Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.75 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
84153 Total, 84154 Free
Fee Code
23375
LOINC
12841-3
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