Collection Notes: Samples should be obtained before biopsy, prostatectomy, prostatic massage or digital rectal examination because manipulation of the prostate gland may lead to elevated PSA levels that persist for up to three weeks. Plasma is not acceptable.
Clinical Utility: The percentage of measured PSA existing in the free form is useful in assessing the risk of prostate cancer in patients with borderline or moderately increased total PSA.
Serum (1 mL)
Ambient 8 Hours
Refrigerated 4 Days
Frozen 12 Weeks
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