Blood culture is an important method used to check for bacteremia. Blood culture is a method of identifying pathogenic bacteria by growing and multiplying bacteria with high nutritional requirements through fresh blood specimens, inoculated on culture media, and identified under certain conditions of humidity and temperature. Blood cultures are used to diagnose the etiology of bacteremia, and results are usually available in 5-7 days. Based on the results, the type of pathogen is determined, and a drug sensitivity test is usually performed at the same time to help select a more targeted antibiotic for treatment. Blood cultures need to be redone after a period of treatment to determine the effectiveness of treatment. Therefore, blood culture is an important method of examining pathogenic microorganisms, which is used for the diagnosis of infectious diseases and the judgment of prognosis.