Serum or plasma concentration of prostatic acid phosphatase (PAP)

What Is Prostatic Acid Phosphatase?

Prostatic acid phosphatase (PAP) is an enzyme found primarily in the prostate gland. It helps break down certain compounds in the body. Elevated levels may suggest prostate tissue activity, including benign prostatic hyperplasia (BPH) or prostate cancer, though other conditions (like liver disease or bone metastases) can also influence it. This test is sometimes used in conjunction with other prostate-related tests for diagnostic or monitoring purposes.

Why Might This Test Be Ordered?

A PAP test may be recommended if you have symptoms like frequent urination, urinary hesitation, or if you’re at higher risk for prostate issues (e.g., family history of prostate cancer). It can also be part of follow-up testing for prostate cancer or other prostate-related conditions. Your doctor may also order it if you’ve had prostate biopsies or treatments.

What Does a PAP Test Involve?

Blood is drawn from a vein in your arm, and the sample is sent to a lab for analysis. The test measures the enzyme’s concentration in your serum or plasma. Results are typically reported as a numeric value, but reference ranges vary by lab and may not apply directly to individual health.

How Is This Test Used in Diagnosis?

While PAP is less commonly used today than PSA, it can help confirm prostate tissue involvement in conditions like prostate cancer or advanced prostate disease. High levels may prompt further testing, such as imaging or biopsy, to investigate underlying causes. Always discuss results with your healthcare provider.