Ultrasensitive C-reactive protein is a C-reactive protein in plasma, also known as high-sensitivity C-reactive protein. Ultrasensitive C-reactive protein is a non-specific marker of the acute phase of the systemic inflammatory response synthesized by the liver and is one of the most powerful predictors of the risk of cardiovascular events. A high level of ultrasensitive C-reactive protein reflects the possibility of bacterial and fungal infections in the body and may also be associated with cardiovascular and cerebrovascular diseases. Some research investigations have shown that among elderly patients with acute cerebral infarction, the prognosis of elevated C-reactive protein is poor. The level of ultrasensitive C-reactive protein correlates with the size of the infarct and the degree of neurological deficit, which is one of the degrees of lesions in patients with cerebral infarction, and C-reactive protein is also involved in the pathological process of thrombosis and atherosclerosis, and is an important factor in atherosclerosis.