Internal Consistency of the Hadlock Estimated Fetal Weight Reference: Methodological Analysis
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The authors aimed to evaluate the internal consistency of the Hadlock estimated fetal weight (EFW) reference by comparing chart-derived and equation-derived centiles in a population of pregnancies. Their analysis revealed a significant disparity between the two methods, particularly at critical thresholds (3rd and 10th centiles), indicating that the chart underestimates the incidence of small for gestational age fetuses. This suggests that reliance on the Hadlock chart may lead to misclassification in clinical practice.
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