336: Ultrasound derived estimated fetal weight using customized standards: does it improve prediction of adverse pregnancy outcomes?

gestational age at delivery, infant gender, mode of delivery, birthweight, and gestational age at maximal bowel dilation. Infants requiring surgery had statistically significant maximal bowel dilation at 50% and 100% increases over the 90th percentile (p .02, p .004). These infants also had significantly higher maximal bowel diameters (p 0.01), and hospital length of stay (p .007) (Table). CONCLUSION: Prenatal diagnosis of bowel dilation is concerning and may suggest the presence of bowel obstruction requiring surgical intervention. Our data show that the degree of bowel dilation antenatally may be a better predictor in determining those infants most likely to require surgery. Further examination of surgical cases is required to determine the degree to which ultrasound diagnosis of bowel dilation can predict surgical diagnosis.