Journal of South Asian Federation of Obstetrics and Gynaecology

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VOLUME 12 , ISSUE 4 ( July-August, 2020 ) > List of Articles

RESEARCH ARTICLE

Comparison of Estimation of Gestational Age by Transverse Cerebellar Diameter with Biparietal Diameter in Third Trimester of Pregnancy

Parul Sinha, Mansi Gupta, Rakhi Sharma, Kumkum R Srivastava

Citation Information : Sinha P, Gupta M, Sharma R, Srivastava KR. Comparison of Estimation of Gestational Age by Transverse Cerebellar Diameter with Biparietal Diameter in Third Trimester of Pregnancy. J South Asian Feder Obs Gynae 2020; 12 (4):235-238.

DOI: 10.5005/jp-journals-10006-1793

License: CC BY-NC 4.0

Published Online: 28-09-2020

Copyright Statement:  Copyright © 2020; The Author(s).


Abstract

Aims and objectives: To determine the accuracy of transverse cerebellar diameter for assessment of gestational age in comparison with biparietal diameter (BPD) in third trimester of pregnancy using the 1st day of the last menstrual period (LMP) for calculation of the actual period of gestation. Materials and methods: The study was a prospective observational study conducted on 150 antenatal patients between gestational ages 28 weeks and 40 weeks visiting the outpatient department and emergency of Department of Obstetrics and Gynecology, Era's Lucknow Medical College and Hospital, Lucknow. After obtaining detailed history and doing thorough clinical examination, ultrasound of all selected cases was performed; transcerebellar diameter (TCD) and BPD were measured and compared with LMP. Results: Difference between actual gestational age and gestational age assessed by BPD ranged from −5 to 9 days and by TCD ranged from −6 to 7 days irrespective of gestational age. With respect to mean difference between estimated gestational age by TCD and actual gestational age, it was higher for 28 weeks (1.89 ± 1.32 days) and 34 weeks (1.94 ± 1.53 days) as compared to that at 36 weeks (0.82 ± 0.71 days). Statistically, this difference was significant (p < 0.001). For overall assessment as well as assessment at different gestational ages, mean error was higher for BPD as compared to TCD (p < 0.001). Conclusion: In the given scenario, both TCD and BPD were quite useful as observed in the present study; however, in statistical terms, TCD was definitely better as compared to BPD. The applicability and validity of these results in a relaxed sampling frame needs to be validated in further studies.


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