CA199 45 units per milliliter is slightly elevated, it is recommended to review again. The normal value of CA199 is 0~37IU/ml, which is a kind of tumor marker, in the clinic, the obvious elevation of this index needs to be alerted to the existence of related malignant tumors, such as cholangiocarcinoma, gastric cancer, liver cancer, pancreatic cancer, colon cancer and so on. Of course, in benign diseases such as acute pancreatic inflammation, cholecystitis patients can also appear CA199 value increased. During physiological periods such as pregnancy and menstruation, a slight increase in CA199 may also occur, due to errors in the measuring instruments of the testing organization, but the magnitude of the increase in the above cases is relatively insignificant. If CA199 is found to be significantly elevated in the clinic, it is necessary to carry out relevant examinations in conjunction with the patient’s clinical symptoms, such as abdominal pain, jaundice, weight loss, etc., and it is necessary to be vigilant about the existence of malignant tumors of the pancreas. It is recommended to consult the gastroenterology department of a regular hospital to determine the increase of CA 199 value.