CA 19-9 is not sensitive or specific enough to be considered useful as a tool for cancer screening. Its main use is as a tumor marker:  to help differentiate between cancer of the ...

Acid phosphatase, also known as prostatic acid phosphatase (PAP), is an enzyme found primarily in the prostate gland, with high concentrations found in the seminal fluid. It is ...

The CEA test measures the level of carcinoembryonic antigen (CEA) in the blood. CEA is a protein normally found in the tissue of a developing baby in the womb. The blood level of this ...