A free prostate-specific antigen (PSA) test is used to confirm test results from a PSA test. A PSA test is used to see if you may have prostate cancer. The test measures the level of PSA in your blood. If your levels are high, you may have a condition that’s not serious, such as a prostate that’s enlarged or inflamed prostate, or you might have prostate cancer. A free PSA test may be used instead of a biopsy to rule out prostate cancer, though you may still need a biopsy if your free PSA test results indicate a risk of cancer.

SPECIMEN: 2 mL (1 mL min.) serum from 1 SST. Ship refrigerated or frozen. Do not draw sample within 7 days of Digital Rectal Examination (DRE) or Rectal Prostatic Ultrasonography.
STABILITY: Room: 2 hrs; Refrigerated: 24 hrs; Frozen: 4 weeks
REPORT: Daily
INSTRUCTIONS: Do not give sample within 7 days of Digital Rectal Examination (DRE) or Rectal Prostatic Ultrasonography.
USAGE: PSA exists in serum in complexed and unbound form (free PSA). Higher total PSA levels with lower percentage of free PSA are associated with high risk of Prostate cancer.