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Objective

To assess characteristics of discordance in umbilical artery Doppler (UAD) S/D ratio measurements in fetuses initially diagnosed with fetal growth restriction (FGR) who demonstrated improvements in growth on long-term follow-up.

Study Design

Singleton gestations were assessed for fetal growth restriction (FGR), defined as an estimated fetal weight (EFW) less than the tenth percentile. Eligible fetuses were prospectively observed at a tertiary referral center from 2012 to 2014 with weekly UAD measurements of the umbilical arteries. Two S/D ratio measurements were obtained for each artery, and results were classified as normal (per gestational age nomograms) or abnormal (elevated, absent, or reversed end-diastolic flow). Management occurred per departmental guidelines. If discordant results were obtained, the most abnormal measurement was used to dictate patient care. If a fetus was initially …