PSA Test
A blood test for prostate-specific antigen, used to check for prostate problems including cancer.
Quick Summary
To investigate urinary symptoms or, after discussion, to screen for prostate cancer.
Prostate-specific antigen level.
Avoid ejaculation and vigorous exercise for 48 hours before; tell your doctor about a recent UTI.
Overview
PSA can be raised by an enlarged prostate, infection or cancer.
Testing has benefits and drawbacks; discuss them with your doctor.
What It Measures
PSA
Blood level.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| PSA | Below 4 | ng/mL |
Interpreting Results & Next Steps
Discuss with Doctor
Finasteride lowers PSA readings. Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
A raised PSA may need repeat testing, an MRI or biopsy.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Prostate-Specific Antigen (PSA) Test(opens in a new tab) · MedlinePlus, US National Library of Medicine
- PSA test(opens in a new tab) · NHS