CA125 value of 40 has exceeded the reference range of CA125 normal value, not normal, but CA125 itself has no relationship with pneumonia. CA125 is a glycoprotein tumor-associated antigen, the normal value of 0-35U/ml, mainly in the epithelial cells of ovarian tumors and the patient’s serum, most commonly used in the detection of ovarian cancer, breast cancer, pancreatic cancer, lung cancer and other diseases in the patient’s CA125 value will also be increased. Patients with gynecologic inflammatory diseases such as ovarian cysts also have mildly elevated CA125. Laboratory indicators in patients with pneumonia, typically an increase in leukocytes and neutrophils in the blood count, do not cause an increase in CA125. There is no necessary connection between the two, the most likely is itself increased CA125, and have pneumonia. When CA125 is found to be elevated, you should be highly vigilant and have it reviewed in a timely manner.