How many days after the injection of IUD can be drained mostly depends on the degree of adhesion between the intrauterine tissue and the tissue of the uterine wall. If the adhesion is dense, it cannot be drained even with the injection of IUD, and needs to be treated by surgery.
Most of the intrauterine tissue that is not adherent to the uterine lining can usually be drained within 24 hours after the injection of IUD. For intrauterine residues that are adherent to the uterine wall, especially those with dense adhesions, it is not easy to expel intrauterine residues even if uterine contractions are promoted with the use of uterotonin, which will result in the residues not being discharged, and in this case, the uterus can be cleared under the guidance of ultrasound or hysteroscopy.
Postpartum, including abortion, requires regular review, and if there is any abnormality, it should be dealt with in a timely manner.