The order of disinfection for lithotomy surgery generally needs to be determined according to the surgical site, and usually cannot be generalized. For example, perineum area, anal area, and lower abdomen and perineum operation.

1. Perineum area: When disinfecting the perineum area, iodophor can generally be used to start disinfection from the 4 sides, and then gradually proceed to the perineum area.

2. Anal area: When disinfecting the anal area, it is generally necessary to disinfect from the outer side first, and then proceed to the surgical center.

3. Operation on the lower abdomen and perineum: Generally, it is necessary to disinfect the lower abdominal area first, and then disinfect the perineum area. Alcohol or iodophor can be chosen for disinfection.