The clinical significance of C-reactive protein mainly includes assisting in the diagnosis of inflammation, tissue injury, and identifying the cause of infection. 1.C-reactive protein as an acute phase reactive protein in various acute inflammation, tissue injury, myocardial infarction, surgical trauma and other diseases after the onset of a few hours of sharp rise, the value of the doubled increase. When the disease improves, it rapidly drops to normal, and its elevation is positively correlated with the degree of infection. 2. Clinical significance of C-reactive protein for differential diagnosis of infection: C-reactive protein can be used as a differential diagnostic index for bacterial and viral infections, CRP is obviously elevated in bacterial infections, while CRP is mostly normal in viral infections. 3. Clinical significance of ultrasensitive C-reactive protein in the diagnosis of cardiovascular diseases: Ultrasensitive C-reactive protein data is also often used in the prediction of cardiovascular diseases, which is of great clinical significance. In short, C-reactive protein test results are widely used in clinical practice, and its scope of application in clinical diagnosis is also expanding, and is gradually becoming a clinically important test data.