Predicting Ectopic Pregnancy Using Human Chorionic Gonadotropin (hCG) Levels and Main Cause of Infertility in Women Undergoing Assisted Reproductive Treatment: Retrospective Observational Cohort Study

Huiyu Xu   ¹ , PhD, MD ;   Guoshuang Feng   ² , PhD ;   Yuan Wei   ¹ , MD, PhD ;   Ying Feng   ¹ , MD, PhD ;   Rui Yang   ¹ , MD, PhD ;   Liying Wang   ¹ , MD, PhD ;   Hongxia Zhang   ¹ , MD, PhD ;   Rong Li   ¹ , MD, PhD ;   Jie Qiao   ¹ , MD, PhD

¹ Peking University Third Hospital, Beijing, China

² Beijing Children’s Hospital, Beijing, China