Overview
PSA is a protein produced by the prostate. A rise in its blood level may relate to prostate enlargement, inflammation or cancer.
Why it's done
It is used for prostate-cancer screening (usually from age 50, earlier if at risk), for urinary problems and to monitor treatment.
How to prepare
For 48 hours before the test, avoid intense exercise, cycling and ejaculation, which can temporarily raise PSA.
What to expect
A venous blood draw.
Understanding the results
A raised PSA is not a cancer diagnosis — it can rise for other reasons too. The result is assessed with age and trend in mind, often with further urological evaluation.