Cavoretto P, Farina A, Gaeta G, et al. - Given that gestational age and birthweight are higher for pregnancies obtained by frozen blastocyst transfer (FBT) as compared with those derived by fresh blastocyst transfer (fresh), researchers examined uterine artery pulsatility index (UtA-PI) during pregnancies obtained by in vitro fertilization (IVF)/ intracytoplasmic sperm injection (ICSI) techniques employing either fresh or cryopreserved blastocysts, in relation to pregnancy outcomes. Serial ultrasound assessment was performed in singleton evolutive IVF/ICSI pregnancies at San Raffaele Hospital at 7-37 gestational weeks in this longitudinal study. They gathered and examined 625 observations in 367 IVF/ICSI cycles. Outcomes revealed lower UtA-PI and proportion of small-for-gestational-age in pregnancies after frozen as compared with fresh blastocyst transfer.