The normal value of the tumor marker CA19-9 indicator varies slightly from hospital to hospital. If the hospital stipulates that the normal value is 0-35kU/L, and greater than 35kU/L is abnormal, but normal people can also have a slight increase in CA19-9, which needs to be reviewed regularly. If it can return to normal in a short period of time, then it can be ignored, if the index is found to be progressively elevated after review, it is necessary to be alert to whether it is related to tumors.CA19-9 is the most important tumor marker for pancreatic cancer, in addition, gastrointestinal tumors, bile duct tumors and gynecological tumors can also cause the value of CA19-9 to be elevated, and it is necessary to confirm the diagnosis by combining with other tests.