Posterior fornix aspiration is a common operation done to clarify the nature of pelvic fluid in women. The posterior fornix puncture procedure involves disinfecting the vulva and vagina, spreading a sterile towel, exposing the cervix with a speculum, and using a cervical forceps to clamp the posterior lip of the cervix to fully expose the posterior fornix. If there is a large amount of fluid in the pelvis, the posterior fornix is often shown to be fuller. The posterior fornix is disinfected again, and a 5 ml empty needle is used to puncture vertically into the posterior fornix at the point where it is full, and the back syringe can be used to draw out fluid or inflammatory pelvic fluid, etc. At the end of the puncture the posterior fornix is again disinfected and the cervical forceps are removed.