Prostrate Specific Antigen (PSA)
The PSA test is a blood test used primarily to screen for prostate cancer.
The test measures the amount of prostate-specific antigen (PSA) in your blood.
PSA is a protein produced by both cancerous and noncancerous tissue in the prostate, a small gland that sits below the bladder in men.
PSA is mostly found in semen, which also is produced in the prostate. Small amounts of PSA ordinarily circulate in the blood.
The PSA test can detect high levels of PSA that may indicate the presence of prostate cancer. However, many other conditions, such as an enlarged or inflamed prostate, can also increase PSA levels. Therefore, determining what a high PSA score means can be complicated.
Why it's done
Prostate cancer is common, and a frequent cause of cancer death. Early detection may be an important tool in getting appropriate and timely treatment. Men with prostate cancer may have elevated levels of PSA. However, many noncancerous conditions also can increase the PSA level. The PSA test can detect high levels of PSA in the blood but doesn't provide precise diagnostic information about the condition of the prostate. The PSA test is only one tool used to screen for early signs of prostate cancer. Another common screening test, usually done in addition to a PSA test, is a digital rectal exam.
What you can expect at B&J Medical Diagnosis
A medical technician will use a needle to draw blood from a vein, most likely in your arm. The blood sample is then analyzed in the lab to measure your PSA level.