C-reactive protein above 150 mg/L will take a few days to come down, depending on the specific cause, the severity of the disease, and the effectiveness of control. C-reactive protein is an acute inflammatory response protein produced mainly by the liver, which rises sharply when the body is exposed to infection or tissue damage. Under normal circumstances, the normal value of C-reactive protein is 0-10 mg/L. If the C-reactive protein is increased to 150 mg/L or more due to myocardial infarction, the patient will gradually come down to normal after about 10-14 days of medication due to the slow process of disease control when conservative treatment is chosen; if the patient has undergone coronary stent surgery, the C-reactive protein can come down to normal after the symptoms of infarction are relieved 3-5 days after surgery. Gradually to normal. Elevated C-reactive protein caused by various infectious and septic diseases can be reduced to normal about 5-10 days after the infection and purulent inflammation are controlled. If a patient has an acute infection with C-reactive protein above 150 mg/L, a comprehensive judgment should be made under the guidance of a physician in combination with other laboratory indicators. If there is no acute infection and C-reactive protein is elevated during the test, be alert to the risk of developing cardiovascular system disease.