PSA levels usually increase with age, so the older you are the higher you can expect your PSA levels will be. PSA levels also vary depending on the size of your prostate.

The study found that 21 of the 160 (13%) patients referred with an elevated PSA had on repeat testing a PSA level, which was within their age-specific reference range.

In addition to race, other factors known to influence PSA levels include age and the presence of non-cancerous prostate disease.

Cases and controls were frequency matched on age and PSA level. In a similar manner, we identified 206 cases and 133 controls treated at Mayo Clinic in Florida between 2006 and 2011.

PSA levels can range from less than 1ng/ml to hundreds of ng/ml. The NHS says that if you're aged 50 to 69, your PSA level is considered raised if it's 3ng/ml or higher.

An enlarged or inflamed prostate, which is common in men over age 50, can also give a slight boost to PSA readings. What's more, the test isn't terribly accurate.

June 24, 2002 Question There is controversy regarding accepting a donor who has high prostate-specific antigen (PSA) levels because in most, but not in all, cases this indicates prostate cancer.