Clinically, clearance surgery is required for certain indications, such as residual placenta-fetal membranes after delivery, or residual fetal membranes after induction of labor or incomplete abortion caused by surgery after abortion, or intrauterine residues after medication abortion. If the clinical condition is due to some disease, such as incomplete menstruation, abnormal thickening of the endometrium, or abnormal echogenicity or mixed echogenic masses in the uterus by ultrasound, in this case, diagnostic scraping is required rather than curettage. Therefore, the uterus should be cleared only if there are indications, and diagnostic scraping is required if certain diseases are present.