Can stomach cancer be detected through blood tests?

Can gastric cancer be detected by blood tests? As people's health awareness continues to improve, many friends go for gastric cancer tests when they find stomach discomfort. Some hospitals recommend blood tests for gastric cancer. Is a blood test for gastric cancer useful? Let's take a closer look to see if gastric cancer can be detected by blood tests.

New diagnostic methods, such as blood tests for gastric cancer, not only help detect gastric cancer early, but also help observe whether anti-cancer drugs are effective.
Gastric cancer blood test items: blood routine, erythrocyte sedimentation rate, stool routine, occult blood test, gastric juice examination, serum gastrin determination, serum carcinoembryonic antigen (CEA). The test results are judged as follows:
(1) Blood examination showed microcytic hypochromic anemia.
(2) Erythrocyte sedimentation rate usually increases.
(3) Fecal occult blood tests are often persistently positive.
(4) Gastric juice may be mixed with blood or present as coffee-colored sediment, and the levels of lactic acid, lactate dehydrogenase, and β-glucuronidase may be increased.
(5) Serum gastrin is significantly elevated.
(6) Serum carcinoembryonic antigen (CEA) may be positive.
Serological methods for detecting tumor markers of gastric precancerous lesions or gastric cancer with potential clinical application value are being explored, such as pepsinogen, which is a precursor of pepsin. In chronic atrophic gastritis, as the gastric mucosa is replaced by intestinal epithelium, the level of pepsinogen I also decreases. The ratio of pepsinogen I/pepsinogen II can predict the risk of gastric cancer.