Crp (C-reactive protein) greater than 5 mg/L means that the C-reactive protein is above the normal range, indicating the presence of an acute illness in the organism. C-reactive protein is a kind of acute time-phase reactive protein synthesized by liver, which can react with C polysaccharide of the cell wall of S. pneumoniae, and it is widely found in serum and other body fluids, and the normal value should be lower than 2.87mg/L (rate-scattering turbidimetry), and the value of more than 5mg/L is obviously higher than the normal range, which means that there is an acute disease in the organism. Elevated C-reactive protein is seen in septic infections, tissue necrosis, malignant tumors, connective tissue disease, acute rejection of organ transplantation, etc. It can be used to identify bacterial and non-bacterial infections (elevated bacterial infections), to identify the active and stable phases of rheumatic fever (elevated in the active phase), and to identify organic and functional disorders (elevated in the organic disease). If C-reactive protein is greater than 5mg/L, please go to the hospital in time to find out the cause of the disease and target treatment, do not blindly use drugs to avoid delaying the condition.