There are many tests that can be done in serum, including routine blood tests, blood biochemistry (such as liver function, kidney function, blood lipids, blood glucose), which can be checked in serum, and these are biochemical tests. There are also immune-related indicators such as thyroid function, cortisol rhythm, ACTH, sex hormones, tumor markers and coagulation tests, all of which can be detected from the blood serum. Various viruses, such as hepatitis B virus and HIV, can also be detected. In short, serum tests can detect many indicators of the human body, which are of great value for the determination of human diseases.