Anti-Free PSA Antibody [103]

Produced as a mouse IgG2a monoclonal reagent and conjugated to horseradish peroxidase, this anti-free PSA antibody from Antibodies.com targets the unbound fraction of Prostate-Specific Antigen (fPSA) circulating in human serum. Clone 103 recognizes an epitope specific to free, non-complexed PSA, distinguishing it from PSA bound to alpha-1-antichymotrypsin (ACT). This selectivity supports research into the free-to-total PSA ratio, a clinical marker used to refine prostate cancer risk assessment alongside total PSA measurement. The HRP conjugate enables direct chromogenic detection in ELISA workflows when paired with substrates such as TMB, removing the need for a secondary antibody step. Supplied as a liquid formulation in 200 µl volumes and validated for reactivity with human samples, the reagent integrates into established immunoassay protocols used in prostate cancer biomarker studies.