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PSA – Prostate-Specific Antigen Explained

PSA (Prostate-Specific Antigen) is a protein produced by the prostate gland. Elevated PSA levels in the blood may indicate prostate cancer or other prostate conditions.

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Things worth knowing about "PSA"

PSA (Prostate-Specific Antigen) is a protein produced by the prostate gland. Elevated PSA levels in the blood may indicate prostate cancer or other prostate conditions.

What is PSA?

PSA (Prostate-Specific Antigen) is a protein primarily produced by the glandular cells of the prostate. It can be measured in the blood and serves as an important biomarker in urology. An elevated PSA level may point to various prostate conditions, but it is not a definitive indicator of prostate cancer on its own.

Biological Function

PSA is a serine protease (a protein-digesting enzyme) that physiologically functions to liquefy the semen coagulum after ejaculation, thereby supporting sperm motility. Small amounts of PSA naturally enter the bloodstream, where they can be detected and measured.

When is the PSA Test Used?

The PSA test is a blood test that measures the concentration of PSA in the serum. It is used for:

Early detection and screening for prostate cancer (prostate carcinoma)
Monitoring treatment response after prostate cancer therapy
Surveillance of known benign prostatic hyperplasia (BPH)
Evaluation of suspected prostatitis (inflammation of the prostate)

Reference Values and Interpretation

PSA levels are expressed in nanograms per milliliter (ng/ml). General reference ranges include:

Below 4 ng/ml: Generally considered normal (age-dependent)
4 to 10 ng/ml: Gray zone – further evaluation is recommended
Above 10 ng/ml: Elevated risk for prostate cancer, further diagnostics required

Important: PSA levels are age-dependent and can be elevated in benign conditions such as BPH or prostatitis. Therefore, clinical context and medical judgment are always required when interpreting results.

Causes of an Elevated PSA Level

An elevated PSA level can have various causes:

Prostate cancer (malignant tumor of the prostate)
Benign prostatic hyperplasia (BPH) – non-cancerous enlargement of the prostate
Prostatitis – inflammation of the prostate
Mechanical irritation (e.g., after catheterization, prostate biopsy, or cycling)
Ejaculation shortly before blood collection

Further Diagnostic Steps

If PSA levels are abnormal, the following tests may be used for further evaluation:

Digital rectal examination (DRE) – physical palpation of the prostate
Transrectal ultrasound (TRUS) – imaging of the prostate gland
Prostate biopsy – tissue sampling for histological analysis
Multiparametric MRI (mpMRI) – high-resolution imaging for tumor localization
Measurement of the free PSA ratio (free-to-total PSA) for risk stratification

PSA and Prostate Cancer Screening

The PSA test is an important tool in prostate cancer early detection, but it remains a topic of debate, as it can be elevated in benign conditions and may lead to overdiagnosis. Most clinical guidelines recommend that men aged 50 and older (or 40 and older with a family history) discuss the benefits and limitations of PSA testing with their healthcare provider before proceeding.

References

European Association of Urology (EAU) – Guidelines on Prostate Cancer (2023). uroweb.org
American Cancer Society – Prostate-Specific Antigen (PSA) Test. www.cancer.org
Catalona WJ et al. – Measurement of Prostate-Specific Antigen in Serum as a Screening Test for Prostate Cancer. New England Journal of Medicine, 1991.

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