Blood from posterior vaginal fornix puncture does not clot, mainly because traumatic bleeding can cause platelets to be activated or destroyed too much, resulting in more fibrinogen being degraded and consumed, so that the blood does not clot. It is common in internal bleeding from ectopic pregnancy or internal bleeding caused by rupture of the ovarian corpus luteum, and after posterior vaginal fornix puncture often non-clotting blood is drawn, which can make a preliminary diagnosis. For internal bleeding, it is recommended that depending on the amount, the patient should be treated according to the corresponding clinical symptoms, some can be treated conservatively and some need to be treated surgically. If conservative treatment fails, surgical treatment is also needed, and must have the condition of close observation before giving conservative treatment.