Drug sensitivity testing, also known as drug sensitivity testing, is when there is a bacterial infection or suspected bacterial infection in a certain part of the body, depending on the site of infection, specimens such as sputum, blood, urine, feces, cerebrospinal fluid, pleural fluid, ascites, and pus can be taken to the hospital’s bacteriology laboratory. The bacteriology room inoculates the specimens onto culture media and cultures the specimens for bacteria to observe the presence and growth of bacteria and to identify the type of bacteria. At the same time, a variety of antimicrobial drugs are selected to test whether they can kill the growing bacteria or inhibit the growth of bacteria and their ability to kill or inhibit the growth of bacteria; those with strong ability are called sensitive, those with poor ability are called resistant, and those with average ability are called intermediaries. The bacteriology laboratory sends a report to the clinician, and the clinician gets the report and makes a comprehensive judgment on the need to adjust antibacterial drugs based on the results of the drug sensitivity test combined with clinical treatment. That is, drug sensitivity test can be used to guide doctors to apply antibacterial drugs rationally, thus reducing the blindness of treatment.