Glycoantigen 242, or CA242, is a commonly used tumor marker that is often applied in clinical practice to determine gastrointestinal tumors. However, since its specificity is not high, a single high level of glycoantigen 242 does not necessarily indicate that a patient has a gastrointestinal tumor. The high index can be caused by tumor diseases and non-tumor diseases, and patients need to go to hospital for gastroscopy and colonoscopy to confirm the diagnosis. Common causes 1. Non-neoplastic diseases: If the index is only high, non-neoplastic inflammatory lesions are suspected, such as colitis, gastritis, gastric ulcer, pancreatitis, bile duct epithelial inflammation and other diseases. In addition, dyspepsia can also make the sugar antigen 242 single high; 2. Neoplastic diseases: If the indicator is hundreds of times higher than normal or even more, at this time, malignant tumors of the gastrointestinal tract need to be suspected, such as pancreatic cancer, colorectal cancer, gastric cancer, etc. In addition, although this indicator is often used for the judgment of gastrointestinal tumors, it can also suggest some other tumors, such as ovarian cancer, uterine cancer and lung cancer, etc. Other examination methods 1, abdominal CT: If patients are suspected of having pancreatic diseases, they need to perform abdominal CT examination to confirm the diagnosis through the report showing the pancreas and its surrounding structures. In addition, doctors often combine retrograde cholangiopancreatography to assist in diagnosis. 2. Gastrointestinal endoscopy: If patients are suspected of having digestive system tumors, they need to perform gastrointestinal endoscopy, such as gastroscopy, enteroscopy and duodenoscopy. After lesions are found, endoscopic biopsy can also be performed and sent for pathological examination to clarify the nature and extent of lesions; 3. Gynecological ultrasound and pulmonary CT: Gynecological ultrasound can clearly view the color and shape of uterine body, cervix and other organs to clarify the presence of lesions. In addition, lung CT can clarify the presence or absence of inflammation in the lungs, such as fibrosis of lung tissue and smaller tumors. Caution Patients should not be too alarmed after finding a high glycoantigen 242 mono, and it is recommended to relax and combine the results of other tests for diagnosis.