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Related Experiment Videos

Sex difference in fetal head growth.

W M Moore1, B S Ward, V P Jones

  • 1St Mary's Hospital, Manchester.

British Journal of Obstetrics and Gynaecology
|March 1, 1988
PubMed
Summary

Fetal head growth differs between sexes, impacting pregnancy dating accuracy. This study highlights potential errors in estimating gestational age using biparietal diameter measurements around 16 weeks.

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Development
  • Medical Imaging

Background:

  • Accurate estimation of gestational age is crucial for optimal pregnancy management and outcomes.
  • Ultrasound measurement of the fetal biparietal diameter (BPD) is a common method for dating pregnancies.
  • Existing growth charts may not fully account for sex-specific fetal growth patterns.

Purpose of the Study:

  • To prospectively measure fetal biparietal diameter (BPD) growth during the second and third trimesters.
  • To develop sex-specific fetal head growth curves.
  • To evaluate the impact of sex-specific growth on the accuracy of pregnancy dating.

Main Methods:

  • Prospective longitudinal study design.
  • Measurement of fetal biparietal diameter (BPD) in a cohort of fetuses.
  • Fitting of linear-cubic equations to individual fetal growth data.
  • Generation of mean growth curves for male and female fetuses.

Main Results:

  • Significant differences were observed in the head growth trajectories between male and female fetuses.
  • Individual fetal growth data were modeled using linear-cubic equations.
  • Mean growth curves demonstrated distinct patterns for males and females.

Conclusions:

  • Fetal head growth exhibits significant sex-specific differences.
  • Relying on non-sex-specific BPD measurements for pregnancy dating, particularly around 16 weeks gestation, can introduce errors.
  • Sex-specific fetal growth data may improve the accuracy of gestational age estimation.

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