Prostate-Specific Antigen (PSA) is a protein produced by the prostate gland. This test measures PSA levels in the blood and is primarily used to screen for prostate cancer.
Category: Tumor Markers
Also known as: psa, prostate specific antigen, prostate-specific antigen, total psa
Reference range: 0–4 ng/mL (Source: ABIM)
Standard unit: ng/mL
High values may indicate
High PSA levels may indicate prostate cancer, benign prostatic hyperplasia (BPH), prostatitis, or recent urinary tract procedures.
Low values may indicate
Low PSA levels are generally normal and indicate a lower likelihood of prostate disease.