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Updated: Aug 19, 2026
Murine Fetal Echocardiography
Published on: February 15, 2013
Evaluation of fetal sonographic measurements in the first trimester by transvaginal sonography
L A Izquierdo1, O Kushnir, J F Smith
1Department of Obstetrics and Gynecology, University of New Mexico, Albuquerque.
Abstract:
To assess the reliability of early biometric measurements in pregnancy, transvaginal sonography was performed in 92 pregnancies in the first trimester in a cross-sectional fashion. Measurements included crown-to-rump length (CRL), biparietal diameter (BPD), head and abdominal circumference (HC and AC), and femur length (FL). Stepwise regression analysis of the gestational age was performed. CRL maintained the highest correlation with gestational age (r = 0.99, p less than 0.001). BPD, HC, AC also correlated well. FL showed a less strong correlation with gestational age (r = 0.76, p less than 0.001). CRL remains the standard for early sonography measurements.
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