Early serum beta-human chorionic gonadotropin in pregnancies after in vitro fertilization: contribution of treatment variables and prediction of long-term pregnancy outcome.

Objective: Low initial serum beta hCG is a good predictor of early pregnancy failure. We sought to determine the contribution of treatment variables and the predictive value of early serum beta hCG after IVF on long-term pregnancy outcome.

Design: A retrospective case-control study.