Correlation between ultrasonography measured transcerebellar diameter of foetus with early and late gestational age
Keywords:Transcerebellar diameter, Gestational age, Foetus, Menstrual period
Background: Traditionally, the gestational age of the foetus is determined from the date of the last menstrual period. Prediction of gestational age (GA) based on sonographic foetal parameters is perhaps the cornerstone in modern obstetrics and continues to remain an important component in the management of pregnancies with foetuses who have growth disturbances. The objective of the study was to study the correlation between foetal transcerebellar diameter (TCD) and pregnancy age, addressing early and late gestation periods.
Methods: This prospective observational study was conducted in the 100 pregnant women. Ultrasound examination for TCD and gestation age was done between 20-28 weeks of gestation and between 30-36 weeks of gestation. For the measurement of TCD transverse view of the foetal intracranium was obtained. Statistical analysis was performed using suitable tests.
Results: Mean age of the women was 24.82+3.31 and 85% women were in age group 21-30. The mean TCD in early gestational age i.e. 20-28 weeks was 24.7 ± 3.86 and in late gestational age i.e. 30-36 weeks was 39.31 ± 2.51. Median TCD increases from 20.35 mm at 20 weeks to 41.7 mm at 36 weeks of gestation. The correlation coefficient between gestational age and TCD was 0.971, which indicated high degree of relation with p value <0.0001.Conclusions: This study shows linear relationship between TCD and gestational age at 20-28 weeks & 30-36 weeks. So, TCD is a reliable method of gestational age determination in early as well as in late pregnancy.
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