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Related Concept Videos

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Related Experiment Video

Updated: Nov 14, 2025

Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
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Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction

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Sex differences in fetal Doppler parameters during gestation.

Dakshita Jagota1, Hannah George1, Melissa Walker2,3

  • 1Department of Chemistry, Memorial University of Newfoundland, 283 Prince Philip Drive, St. John's, NL, A1B 3X7, Canada.

Biology of Sex Differences
|March 11, 2021
PubMed
Summary

Fetal sex influences Doppler ultrasound parameters in healthy pregnancies. Umbilical artery and descending aorta pulsatility indices differ between male and female fetuses, while others do not.

Keywords:
Doppler ultrasoundFetal sexPregnancyPulsatility indexSex differences

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Diagnostic Ultrasound

Background:

  • Fetal sex is recognized to impact pregnancy outcomes.
  • Current fetal well-being monitoring relies on Doppler ultrasound of major fetal and placental vessels.
  • Investigating fetal sex effects on Doppler parameters is crucial for understanding pregnancy physiology.

Purpose of the Study:

  • To examine the influence of fetal sex on Doppler parameters throughout gestation in healthy pregnancies.
  • To assess sex-specific variations in fetal and placental vessel pulsatility indices.

Main Methods:

  • Prospective study of 240 pregnant women with regular ultrasound examinations (12-38 weeks).
  • Pulsed Doppler spectra analyzed for umbilical arteries (UAs), middle cerebral artery (MCA), descending aorta (DAo), and ductus venosus (DV).
  • Linear mixed effects models used to evaluate gestational age and fetal sex effects on pulsatility indices (PIs).

Main Results:

  • No significant differences in MCA PI and DV PIV between sexes over gestation.
  • Significant differences in the trajectory of UA and DAo PIs based on fetal sex (p=0.02 and p=0.01).

Conclusions:

  • Doppler ultrasound parameters show fetal sex dependency in specific vessels during healthy pregnancies.
  • Further research is required to elucidate the physiological basis and clinical relevance of these sex differences in pregnancy complications.