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To determine if 1) mean abdominal circumference (AC) of fetuses with gastroschisis are smaller from published normative values and whether 2) diagnosis of AC < 5th percentile is supported by postnatal diagnosis of small for gestational age (SGA).
This was a retrospective review of pregnancies complicated with gastroschisis between 2000 and 2008. AC was classified as < 5th percentile or > 5th percentile on the final sonogram prior to delivery. Intrauterine growth restriction (IUGR) was defined as EFW < 10th percentile. SGA was defined as neonatal birthweight < 10th percentile.
Three hundred sixty eight ultrasound observations, performed in 74 fetuses with gastroschisis, were used for analysis. Mean AC of fetuses with gastroschisis were between the 5th and 50th percentile for gestational age. Of the 30 (40.5%) patients with AC measurements < 5th, 15 (50%) were SGA at delivery. Eleven of the 74 fetuses (15%) were classified as IUGR and all were SGA postnatally.
Mean AC values in fetuses with gastroschisis were below the mean for population established norms. EFW is a better predictor of SGA than AC < 5th percentile. Established biometric curves can be used to evaluate in utero growth patterns in fetuses with gastroschisis.