Carcinoembryonic antigen, the name of which implies an ominous sign, is in fact one of the most important of all tumor indicators. Theoretically, all tumor indicators show normal distribution. For carcinoembryonic antigen, the majority of non-malignant tumor patients, or 97%, have this indicator less than 5.2ng/ml, and about 3% of healthy people have a value greater than this between 5.2 and 7.5. Above 10ng/ml, it is absolutely necessary to be highly alert and undergo the most careful and meticulous examination, because exceeding this level means that nearly 60% may have malignant tumors, and if there are no symptoms at this time, then it is likely that the tumors in your body are still very limited or very small and can be cured by surgery and/or combined chemotherapy and other treatments. Tip: For those who are over 45 years old, please add CEA to your annual physical examination. Who are the lucky ones who do not have malignant tumors with elevated CEA? Including cardiovascular disease, lung inflammation and gastritis can see mild elevation of this indicator. Specifically, chronic bronchitis, emphysema, gastric ulcer, atrophic gastritis and cholecystitis, for example, can lead to mild elevation of CEA. Of course, if the indicator exceeds 7.5, or even 10ng/ml or more, you should not take any chances and need to seek prompt medical attention! If unfortunately CEA is found to be elevated, please consult a doctor promptly, the following is what you need to know seriously: 1. It is better to take another blood test including CA199, CA724, CA242, CA125 and CA153 for women. “If another index is found to be elevated, then we must dig into the ground to find the bad egg of tumor. 2. You can take the first step to have non-invasive examination, including fecal occult blood and “B” examination, including thyroid ultrasound, superficial lymph node examination, etc. Gynecological examination and breast physical examination are also very necessary. 3, if you have a history of smoking, then you should absolutely have a CT lung examination (chest X-ray or chest X-ray wastes time and money, you can just have a CT examination). 4, Gastroscopy must be the next important examination. For women, a mammogram can be done before the gastroscopy, and of course an ultrasound of the breast can be performed directly. 5.If all the above results are okay, then further colonoscopy can be considered next, because carcinoembryonic antigen is also found in colon cancer at the earliest. 6.If there is still no problem, the following options are available: PET-CT examination, which is expensive because it is a self-funded program, and it is also insensitive to lesions that cannot be detected by ordinary examinations such as CT, but it may be helpful for more hidden lesions, such as lymph nodes and lesions in the intestinal wall of the stomach wall, and is limited to people who are not sensitive to the cost.