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The effect of sample collection, storage conditions (time and temperature), and freeze-thaw cycles on the stability of free prostate-specific antigen (fPSA), PSA complexed with α 1 -antichymotrypsin (ACT-PSA), and total PSA (tPSA) in serum was studied. The analytes were quantified using immunoassays for tPSA and fPSA on the Elecsys system 2010 and a research assay for ACT-PSA on the ES system (Roche Diagnostics). The stability of the analytes was calculated as percentages of the values measured in samples 1 h after blood collection. When the samples were stored at 37 °C, at room temperature or at 4 °C, the stability of ACT-PSA was less impaired than that of fPSA. To avoid erroneous results in the determination of PSA isoforms and their corresponding ratios, serum samples should be preserved at 4 °C when the analysis is performed within 8 h after blood collection, or they should be stored at −80 °C if the analysis is not feasible during that period.

Different Stability of Free and Complexed Prostate-Specific Antigen in Serum in Relation to Specimen Handling and Storage Conditions