How long it takes for C-reactive protein to come down above 100 mg/L is related to the type of disease and the severity of the inflammatory response. C-reactive protein is a protein that rises sharply in the plasma when the body is infected or damaged by tissue, and its normal value is in the range of 0-10 mg/L. If there is a variety of septic inflammation that causes C-reactive protein to rise to 100 mg/L, it will gradually drop to normal after the inflammation is controlled in about 5-10 days. If C-reactive protein is elevated after coronary stenting in patients with myocardial infarction, it will decrease to normal in 3-5 days. If the infarction patient is treated conservatively with medication, it will take about 10-14 days for it to decrease to normal. In patients undergoing larger procedures, C-reactive protein will increase within 6 hours and will usually decrease to normal within 2-10 days if there are no other complications; it will not decrease more slowly and may even increase further if there is infection or thrombosis. C-reactive protein as a non-specific inflammatory response factor, its value can only represent whether there is inflammation in the body, but the specific type of inflammation needs to be combined with other test results, as well as specific medical history, symptoms, signs and other comprehensive judgment.