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Subject Area

Obstetrics and Gynecology

Article Type

Original Study

Abstract

Objective To evaluate the accuracy of transcerebellar diameter (TCD) in estimating gestational age (GA) of pregnant women in the third trimester. Background On-target estimation of GA is crucial for favorable outcome of pregnancy. Miscalculation of GA may lead to preterm delivery, low birth weight, and hence perinatal morbidity and mortality. TCD is one of the parameters recently proposed for this aim. Patients and methods This cross-sectional study was conducted on 160 pregnant women in the third trimester of pregnancy who attended the Obstetrics and Gynecology Department of Menoufia University Hospitals during the period from October 2020 to June 2021. Results Of 160 patients of the study, TCD gave accurate assessment in 151 (94%) patients. Femur length gave accurate assessment in 100 (62.5%) patients. However, the biparietal diameter gave accurate assessment in 80 (50%) patients, and abdominal circumference gave accurate assessment in 52 (32.5%) patients. Conclusion TCD is an accurate parameter for assessment of GA in the third trimester exceeding the accuracy of femur length in late gestation. Incorporating measurements of TCD with other routine parameters would minimize the margin of error from the actual GA.

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