The normal value of CA125 in women is no more than 35kU/L. CA125 test is usually used to detect ovarian tumors, especially ovarian plasma tumors, and the increase of its measurement can reflect the malignancy of the tumor, or the treatment effect of the tumor after surgery, and whether there is recurrence or not. CA125 test is clinically more sensitive but less specific, because besides ovarian tumors, other diseases may also cause CA125 increase. CA125 test is clinically more sensitive but less specific because besides ovarian tumors, other diseases may also cause CA125 increase, such as breast cancer, pancreatic cancer, gastric cancer, lung cancer, and even inflammation of the pelvis.