What kinds of clean operating rooms are there? The first level is a particularly clean operating room, which can be used for organ transplantation, joint replacement or eye surgery, heart surgery, brain surgery and other operations. The second level is a standard clean operating room, which can be used for plastic surgery, thoracic surgery, bone surgery, hepatobiliary and pancreatic surgery, urology and general surgery, and the third level is a general clean operating room, which can be used for general surgery or gynecological surgery. Level 4 is a quasi-clean operating room, which is mainly used for pollution or anorectal surgery.