Successful pregnancy rates achieved with day 4 embryo transfers

ObjectiveTo assess the success of day 4 embryo transfers (ETs) following IVF at one institution.DesignRetrospective analysis.SettingA university hospital IVF program.Patient(s)Two hundred nondonor, fresh IVF cycles.Intervention(s)None.Main Outcome MeasureOutcomes of IVF. Outcome assessments after day 4 ETs included rates of implantation, clinical pregnancy, and singleton and multiple live births.Result(s)The overall live-birth rate was 54.4%. Implantation rates were highest in younger age groups, and similar in patients 35–40 years of age. Pregnancy and live-birth rates were similar across all age groups up to age 40 years. Multiple gestations were highest in women ≤40 years of age.ConclusionAcceptable pregnancy rates can be achieved with day 4 ETs.