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To examine the impact of first trimester crown lump length (CRL) measurement errors on the interpretation of estimated fetal weight (EFW) and classification of fetuses into small, large, or appropriate for gestational age in subsequent growth scans. We examine the effects of errors of ±2, ±3 and ±4 mm in the measurement of fetal CRL on percentiles of EFW at 20, 32, and 36 weeks' gestation and classification as small, large or appropriate for gestational age. Published data on CRL measurement error are used to determine variation present in pra