The stability of free and bound prostate-specific antigen.

OBJECTIVE To determine if the assay for free prostate specific antigen (fPSA) and the calculated ratio of fPSA to total PSA (f/tPSA) is stable in conditions likely to be met in routine clinical practice. MATERIALS AND METHODS Two blood samples were obtained from 27 patients attending a routine urology clinic. Sample 1 was centrifuged immediately, assayed… CONTINUE READING