Prostate-Specific Antigen Blood Test (PSA Test)
What Is It?
The prostate-specific antigen blood test (PSA test) is a screening test. It measures the amount of prostate-specific antigen (PSA) in a man's blood.
PSA is a chemical made by the prostate. The prostate is a sex gland located near a man's bladder. It produces the fluid in semen.
PSA levels normally increase as a man ages. But a higher-than-normal PSA level can be one clue that cancer has developed in the prostate gland.