Increased Accuracy of Fetal Weight Estimation with a Gender-Specific Weight FormulaSiemer J.a · Wolf T.b · Hart N.a · Schrauder M.b · Meurer B.b · Goecker T.b · Beckmann M.W.b · Schild R.L.b
Departments of Obstetrics and Gynaecology, University Hospitals,aMannheim, and bErlangen, Germany
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Article / Publication Details
Objective: To test whether Schild’s sex-specific formula for estimating fetal weight is more accurate than commonly used regression formulae. Methods: The gender-specific formula and 10 widely used equations were evaluated in a group of 989 pregnancies. Each fetus underwent ultrasound examination with complete biometric parameters within 7 days before delivery. Results: Over the whole weight range and in the subgroup of newborns with a birth weight between 2,500 and 3,999 g, the sex-specific weight formula from Schild demonstrated the best level of accuracy. For infants with a birth weight of less than 2,500 g as well as for macrosomic newborns, the gender-specific formula did not improve fetal weight estimation. Conclusion: In pregnancies where fetal gender is known, Schild’s regression formula should be used when fetal weight lies within the range of 2,500–3,999 g.
© 2008 S. Karger AG, Basel
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