After miscarriage HCG has been unable to fall, to consider the following three possibilities, different reasons have different response methods, as follows: 1, the most common HCG can not fall, mainly due to incomplete abortion, placental residue, such as this case through the gynecological ultrasound can make some diagnosis. If it is clear that there is residue in the uterine cavity, it must be done to clear the uterus, and the HCG will naturally drop when the placenta is completely out. 2, the HCG has been unable to drop after the abortion, it may be after the abortion to have sex, within a month after the abortion, there are individuals who have sex and become pregnant again, which may also lead to the HCG can not drop, you can check through ultrasound, after 40 days of abortion to do gynecological ultrasound more If the gestational sac is found again at this time, consider that sex after miscarriage leads to another pregnancy and another abortion must be done. 3. In rare cases, the HCG does not come down after miscarriage, or it once dropped and rose again. After excluding the placental residue and the second pregnancy, the HCG does not drop after abortion should be considered as trophoblastic tumor, that is, choriocarcinoma. If this is the case, chemotherapy is necessary and aggressive chemotherapy can achieve a survival rate of more than 90% for choriocarcinoma.