Progesterone/estradiol ratio <0.25 on the day of human chorionic gonadotropin administration is associated with adverse pregnancy outcomes in prolonged protocols for in vitro fertilization/intracytoplasmic sperm injection

• Main Authors: Yuan Li (Author), Keli Luo (Author), Yi Tang (Author), Ge Lin (Author), Guangxiu Lu (Author), Fei Gong (Author)
• Format: Book
• Published: Elsevier, 2017-02-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Objective: It has been suggested that a progesterone/estradiol ratio (P/E2) ≥ 1.0 on the day of human chorionic gonadotropin (hCG) administration indicates premature luteinization and might be associated with an adverse pregnancy; however, a lower limit of this ratio has not been determined. We aime...