... by the cells of the prostate gland. The most frequently used PSA - prostate-specific antigen test - is the total PSA, which measures the sum of the free PSA and the cPSA (complex or bound) in ... level, including prostate cancer, benign prostate enlargement, inflammation, infection, age, and race. If there are no other indicators that suggest cancer, the doctor may recommend repeating ... is a protein normally made in the prostate gland in ductal cells. These cells make some of the semen that comes out of the penis during sexual climax (orgasm). PSA helps to keep the semen liquid.PSA...