The normal value of CA125 in women during menstruation is no more than 35. CA125 is a glycoprotein detected in the antigen test of human ovarian epithelial cells from the ovary. CA125 test is more sensitive in diagnosis but less specific because for example, breast cancer, pancreatic cancer, gastric cancer lung cancer, etc. can show increased CA125. In addition, endometriosis, cirrhosis, and pregnancy in women can also detect an increase in CA125, and some inflammatory states can also cause an increase.