Electrochemiluminescent Immunoassay (ECLIA)
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).
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.
1 - 5 days
- PSA, TOTAL/FREE/RATIO
- Free PSA Ratio
- PSA, Free
- PSA Total and Free, S
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.
Test sent to Mayo Medical Laboratories.