Related Experiment Video
Updated: Aug 12, 2026
Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
Published on: June 29, 2013
[Transvaginal ultrasound biometry in early pregnancy--a growth model]
1Universitäts-Frauenklinik Mainz.
Purpose:
Evaluation of a growth model for the biometric parameters of early pregnancy: Chorionic cavity, yolk sac, amniotic cavity, crown-rump length and biparietal diameter.
Method:
618 clinically well-dated singleton pregnancies of the first trimester were measured in a prospective cross-sectional study with high-frequency transvaginal ultrasound between 28 and 94 days post menstruation.
Results:
Normal curves (5th, 50th, 95th percentiles) for all parameters were established using our growth model. The growth curves of chorionic cavity amniotic cavity, and biparietal diameter showed a linear growth whereas the growth curve of the crown-rump-length represented an exponential curve. Linear growth of the yolk sac was found until 8 weeks of gestation and there was no growth alteration after this time.
Conclusion:
With our growth curves of the first trimester it is possible to monitor the embryonic development with several parameters.
