Prostate Specific Antigen (PSA)?
Prostate Specific Antigen (PSA) is a protein produced within the prostate gland and is secreted into seminal fluid.
There are two types of PSA:
Free PSA: moves freely in the blood as it is unbound to other proteins
Complex PSA: attached to other proteins as it moves around the blood
Free PSA comes from benign prostatic hyperplasia (BPH), an enlargement of the prostate. The higher the amount of free PSA, the less likely prostate cancer will be found as prostate cancer cells produce more complex PSA.
