Days Set Up
Monday - Saturday
Analytic Time

1 - 5 days

MiChart Code
PSA, Total and Free (Sendout)
Soft Order Code

Test Updated:


Free PSA Ratio
PSA, Free
PSA Total and Free, S

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

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.

Specimen Requirements

Collection Onsite

Collect specimen in an SST or red top tube. Refrigerate and send intact specimen within 3 hours of collection. Alternatively, centrifuge, aliquot serum into a plastic vial within 3 hours of collection and freeze.

Collection Offsite

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.

Yellow Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.75 mL serum

Billing Information

CPT Code
84153 Total, 84154 Free
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.