Antigen CA19-9 less than 37 U/mL is considered normal. Glycan antigen 19-9 (CA19-9) is a tumor marker, its normal range is less than 37U/mL, beyond this range can be considered to be increased levels of CA19-9, you need to be vigilant for pancreatic cancer and other digestive cancers, as well as benign diseases of the digestive system and so on. Clinically, elevated CA19-9 can be seen in pancreatic cancer, gallbladder cancer, stomach cancer, acute pancreatitis, cholelithiasis and other digestive diseases. Especially for pancreatic cancer, CA19-9 has high specificity and is often used in the early diagnosis of pancreatic cancer. However, the elevation of CA19-9 tumor alone can not diagnose a certain disease, but also need to combine with the patient’s clinical manifestations and conduct auxiliary examinations to make a judgment, so generally appearing in the case of elevated this marker, but also need to seek help from a professional doctor. If you find elevated CA19-9, please consult a doctor in time.