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Updated: Jun 29, 2026
High Frequency Ultrasound for the Analysis of Fetal and Placental Development In Vivo
Published on: November 8, 2018
Increased accuracy of fetal weight estimation with a gender-specific weight formula
Jorn Siemer1, Tanja Wolf, Nicola Hart
1Department of Obstetrics and Gynaecology, University Hospital, Mannheim, Germany. joern.siemer@gyn.ma.uni-heidelberg.de
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.
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