In general, ca19-9 is more than twice as dangerous as the normal value. ca19-9 is cancer antigen 19-9, a tumor marker associated with pancreatic cancer, colon cancer and gastric cancer, etc. It has high sensitivity and specificity for pancreatic cancer, and its normal value is 37 U/ml. no matter how much this indicator increases, it suggests that there is a risk of cancer, and attention should be paid to it. Cancer antigen 19-9 is high but less than twice the normal value, not necessarily cancer. In general, it is not very dangerous. For example, women who have smoked for a long time and who are pregnant may have a high cancer antigen 19-9 that is less than twice the normal value. However, the indicator returns to normal after the pregnant woman has finished giving birth. The situation where the cancer antigen 19-9 is more than twice the normal value and continues to increase suggests an increased probability of cancer and is dangerous. However, no matter which of the above situations should consult a doctor in time. CA19-9 higher than normal value alone cannot accurately determine the cause, but also needs to be combined with the characteristics of the medical history and other examination results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of a doctor.