Why Is My Doctor Testing My Blood for CA 125? Topic Guide

Why Is My Doctor Testing My Blood for CA 125? Why Is My Doctor Testing My Blood for CA 125?: CA 125 (cancer antigen 125) is a sugar-associated protein (glycoprotein) in the blood that is considered a biomarker (or “tumor marker”) because it is found in greater concentrations in ovarian cancer cells. Doctors test the blood for CA 125 to help diagnose ovarian cancer.

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