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 - Friday
Analytic Time

1 - 3 days

Soft Order Code
PSAFT
MiChart Code
PSA, Total and Free (Sendout)
Synonyms
  • Free PSA Ratio
  • PSA, Free
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.

Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
84153 Total, 84154 Free
Fee Code
23375
LOINC
12841-3
NY State Approved
No