Early Β-Hcg Levels Predict Live Birth after Single Embryo Transfer.

Specific serum beta human chorionic gonadotropin (β-hCG) parameters that can predict live birth after an embryo transfer have yet to be defined. We performed a retrospective cohort study of 1,028 patients with a detectable β-hCG who underwent a single embryo transfer between 2002 and 2019 at a large academic center. Two β-hCG parameters were examined in relation to live birth: 1) “doubling” defined as β-hCG doubling over 48 h and 2) “reaching 100” defined as a β-hCG ≥ 100 mIU/mL by 15 days after oocyte retrieval (AOR). One thousand three hundred forty cycles involving a single embryo were analyzed. Two thirds were frozen embryos and 86