High serum amyloid A is mainly suggestive of the presence of infection or viral infection in the organism, when the virus or bacteria enter the body, to have an inflammatory immune response with the organism, in general, serum amyloid A will peak in about four hours, so it is very conducive to diagnose the trend of the disease. If there is a high serum amyloid A, relevant blood routine, C-reactive protein, blood sedimentation, calcitoninogen and other tests are also carried out to jointly decide what kind of disease the patient is suffering from, and further choose the treatment plan, such as lung infection, urinary tract infection, and infection in the bones. In addition, this indicator can also be used as a test indicator, in the application of the treatment of regular review indicators, to observe the condition of the treatment is effective, timely adjustment of the condition of the treatment of the patient is a guiding indicator.