C-reactiveprotein (CRP) is an acute chronotropic reactive protein synthesized by the liver (acute chronotropic reactive proteins are certain serum proteins produced by the body in response to infection, inflammation, stress, and trauma; these proteins include CRP, fibrinogen, haptoglobin, alpha1 acidic glycoprotein, copper blue protein, alpha1 antitrypsin, etc.) CRP is a commonly used indicator in daily clinical practice. Under normal conditions, its concentration in human serum is very low (<5mg/L), while its concentration often rises significantly during bacterial infection or tissue damage, etc., and has great clinical significance. CRP is widely used in the following areas: 1, diagnosis and identification of infection CRP begins to rise 6-8h after the occurrence of bacterial infection, reaching a peak in 24-48h, and its level drops sharply after effective anti-infection treatment, and usually returns to normal within a week CRP is not significantly elevated in viral infections (usually not more than 50mg/L, rarely more than 100mg/L), so it can be used to To distinguish bacterial infection from viral infection. Elevated C-reactive protein is a risk predictor for cardiovascular disease. In myocardial infarction, CRP often rises within a few hours after the onset of pain, peaks at 3-4 d, and falls to normal 7-10 d after CK-MB returns to normal. 3.Surgery The CRP level in the blood increases significantly 24-72h after the patient performs surgery, and returns to normal on the 5th-7th day. 4, other aspects such as tumor patients with elevated CRP, suggesting a poor prognosis. In addition, the doctor will prescribe blood tests such as routine blood tests and calcitoninogen according to each patient's condition, which, together with the medical history, can effectively diagnose and treat the disease.