Abstract: In vitro fertilization-embryo transfer (IVF-ET) is an effective method and an elective procedure to treat infertility caused by various factors,for example,endometriosis,tubal obstruction,and polycystic ovary syndrome.However,this technique leads to a higher rate of complications and are therefore always iatrogenic such as ovarian hyperstimulation syndrome,thrombosis,multiple pregnancy,adnexal torsion,pelvic inflammatory disease (PID),which may threaten fetal or maternal well-being during the whole pregnancy.[1]