Prostate-Specific Antigen (PSA), Free

Chemiluminescent immunometric assay
Monday - Friday
Within 3 days
The free prostate-specific antigen percentage is an aid in distinguishing prostate cancer from benign prostatic conditions in men age 50 and older with a total PSA between 3 and 10 ng/mL and negative digital rectal examination findings. Prostatic biopsy is required for the diagnosis of cancer.
Specimen Requirements: 

Collect blood by venipuncture into an SST/gold-top tube. For serum, allow the specimens to clot at room temperature. Separate the serums from the cells, using a refrigerated centrifuge and avoid hemolysis. If possible, keep specimens cold (2 - 8°C).

Stability (collection to time of analysis/testing):
  • Refrigerated (2 - 8°C): 48 hours
  • Frozen (-20°C): Indefinitely
Reference Values: 
< 0.7 ng/mL
CPT Code (s): 
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