How do you know if a spontaneous abortion is clean?

After spontaneous abortion, vaginal bleeding lasts for a long time, accompanied by abdominal pain and other abnormal manifestations, the probability of abortion not flowing clean is relatively large. Suggestions: women can go to the hospital to do uterine color ultrasound examination, according to the examination results to determine whether the spontaneous abortion is flowing clean. If the spontaneous abortion is not clean, women need to go to the hospital for treatment.