Abstract
Aim: To evaluate a possible relationship between extended embryo culture and outcome of pregnancies resulting from single embryo transfers (SETs).Design: A retrospective matched case–control studySetting: University fertility centerPatients: About 106 live births from single cleavage embryo transfers were matched 1:2 with 212 live births from single blastocyst transfers.Interventions: A cohort of 3522 fresh SETs using non-donor oocytes in women ≤40 years old from August 2010 to December 2013. Live births were matched by maternal age, body mass index, smoking and parity. Adjustments were made for gender of the baby and embryo quality. Obstetric and perinatal outcomes including birth weight, low birth weight, small for gestational age, preterm delivery, preeclampsia, placental abruption and neonatal complications were compared.Results: Matched live birth outcomes showed no increased risk of obstetric or perinatal complications in pregnancies resulting from single blastocyst transfers compared to single cleavage transfers.Conclusions: Extended culture was not associated with increased adverse obstetric and perinatal outcome in pregnancies resulting from fresh SETs in this study.
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