Definition |
An assay system that indirectly measures the amount of three forms of prostate-specific antigen (PSA) in a patient serum sample and then uses those values to calculate a score that estimates the patient's probability of having prostate cancer. The PSA forms that are examined are total PSA, free PSA, and an isoform of PSA that has a propeptide comprised of two amino acid residues ([-2]proPSA).
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