Standard whole blood C-reactive protein is measured in mg/dl or mg/L, and the normal value is less than 1 mg/dL or 10 mg/L. If the immunodiffusion or turbidimetric method is taken, the normal range is generally between 800-8000 μg/L. Therefore, the normal value of C-reactive protein can vary greatly from laboratory to laboratory and from unit to unit. The C-reactive protein level can be elevated in the early stages of the disease, when it is still on the rise, and can be mildly elevated. Viral infections can also increase C-reactive protein levels, but the degree of elevation is often lower than that of bacterial infections; 2. Trauma: some factors that lead to tissue inflammation and necrosis can also cause elevated C-reactive protein, such as severe burns, trauma, major surgery, etc.; 3. Metabolic dysfunction: for example, obesity and insulin resistance, manifested as mildly elevated C-reactive protein; 4. C-reactive protein is a rapid time phase inflammation index, when the condition is aggravated or improved, the blood C-reactive protein concentration changes faster, to a certain extent, it can reflect the severity of the condition and the effect of treatment.