Yes CA -125 does test for ovarian cancer. It has been around a while. However, it is not particularly accurate. But like 70%. Though it is considered more accurate to prove a negative.

That being said, it is accurate enough to give you a warning. My mom thought she had ovarian cancer. The doctor did the CA 125 test and it came back negative. Mom went on to have an ovarian cyst removed -- and that was biopsied for ovca. Negative.

If I was having any bloating symptoms i would get the CA 125 immediately and if it was positive present it to doctors.