C-reactive protein is an acute temporal reactive protein, C-reactive protein abbreviated CRP, hypersensitive C-reactive protein abbreviated hsCRP. C-reactive protein and hypersensitive C-reactive protein, essentially the same substance. The differences between the two are as follows: First, the test sensitivity, C-reactive protein in the detection method has a high linear range, but the sensitivity is not high, when the C-reactive protein concentration is relatively low, can not be detected and changes. Ultrasensitive C-reactive protein has both high sensitivity and wide linearity, and can sensitively detect changes in C-reactive protein. Second, the clinical application, C-reactive protein in a variety of acute injuries, inflammation, surgical injuries and other disease episodes a few hours after the rapid rise, the condition can be improved after the decline to normal. Ultrasensitive C-reactive protein, on the other hand, is suitable for some cases where the level of C-reactive protein is low, such as newborns, whose changes cannot be measured by conventional C-reactive protein measurement methods, and can only be measured by ultrasensitive C-reactive protein. Ultrasensitive C-reactive protein is of higher diagnostic value in patients with infections that do not have high white blood cells, or are immunocompromised.