Prostate-Specific Antigen (PSA) in Serum by Immunoassay Probe

Why Might You Need This Test?

Your doctor may recommend a PSA test if you have symptoms like urinary problems, pain in the pelvic area, or if you’re at higher risk for prostate issues due to age, family history, or other medical conditions. It can also be used during routine check-ups for men over 40 or as part of screening for prostate cancer.

What Does a PSA Test Measure?

PSA is a protein that helps liquefy semen during ejaculation. While most PSA comes from the prostate, small amounts can also come from other parts of the male reproductive system. Elevated PSA levels may suggest prostate inflammation, infection, benign prostatic hyperplasia (BPH), or cancer, though other factors can influence results.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is then sent to a lab where it’s analyzed using an immunoassay probe to detect PSA levels. The test typically takes a few hours to complete, and results are usually available within a day or two.

What Do the Results Mean?

PSA results alone don’t diagnose prostate cancer—they’re part of a broader evaluation. Your doctor will consider your PSA level, symptoms, age, family history, and other test results (like a digital rectal exam or imaging studies) to determine next steps. Very low PSA levels may indicate no issues, while very high levels may prompt further testing.