Gynaecology & Obstetrics Tumor Markers 2a401b67 CA 125 upper limit of normal is - A 25U/ml B 30U/ml C 35 U/ml D 40U/ml High-Yield Explanation Ans. is 'c' i.e., 35 U/ml o Serum value of 35 U/ml of CA 125 repreents 1 % of the healthy females and is often accepted as the upper limit of normal in clinical practice.