After miscarriage, patients can determine whether the miscarriage is clean through clinical symptoms, hormone tests and ultrasound examinations. 1. Clinical symptoms: nausea and vomiting, frequent urination, breast tenderness and other pregnancy reactions disappear, vaginal bleeding stops, and lower abdominal pain improves, generally it can be judged that the abortion is clean. 2. Hormone examination: human chorionic gonadotropin is elevated and maintained at a certain level during pregnancy, and HCG is generally normal after abortion for about 2 to 3 weeks. 3. Ultrasound: Use the probe to observe the uterine cavity, if there is no enhancement of echoes in the uterine cavity, no residue, then the abortion is clean. If the patient wants to determine whether the miscarriage is clean, it is recommended to consult a doctor in a timely manner, with the help of the doctor to clarify the diagnosis, and to carry out targeted treatment and therapy.