Abstract
Background: To find out correlation between biparietal diameter and gestational age
 Methods: This was a cross sectional study of uncomplicated pregnant women who presented for routine obstetric ultrasound at S M S medical college & hospital.
 Informed consent was obtained from the patients before inclusion in the study. Only singleton pregnancies were included. Exclusion criteria included pregnant women who had concomitant disease that could possibly affect fetal growth (e.g. diabetes mellitus, asthma, hypertension, renal disease, thyroid disease), complicated pregnancy (e.g. bleeding, preeclampsia), foetal abnormality detected during the examination, women with a history of obstetric complications, intrauterine growth retardation and macrosomia
 Results: The cases were in the age group of 18 to 37 yrs. Maximum number of cases are in middle age group and minimal in elderly age group. Mean BPD at 41 weeks of gestational age was 89.00 mm and 40 weeks of gestational age was 88.00±3.42 mm.
 Conclusion: It can be concluded from the study that there is good correlation of BPD measurement by ultrasonography and gestational age. It is a reliable tool especially in those women where LMP is not known or doubtful, for assessing gestational age.
 Keywords: Gestational Age, Biparietal Diameter, Trimester, Pregnant Women
Highlights
The correct clinical diagnosis of fetal growth disturbances has important implications for proper prenatal care and for determination of the delivery time
Many curves and reference tables for fetal biometry have been published in the literature, using mean values of the bi-parietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length FL, which allow estimation of the fetal weight
Campbell S. et al[3] and Waldenstrom U et al[4] observed that bi-parietal diameter was more accurate predictive of expected date of delivery (EDD) than that calculated from the first day of last menstrual period (LMP)
Summary
The correct clinical diagnosis of fetal growth disturbances has important implications for proper prenatal care and for determination of the delivery time. Fetal biometry by ultrasonography is the most widespread method used to establish gestational age, estimate fetal size and monitor its growth[1]. Researchers have been focusing in recent years on population specific fetal biometric parameter charts for various ethnic groups and the inter population variability in foetal growth patterns.[2] Campbell S. et al[3] and Waldenstrom U et al[4] observed that bi-parietal diameter was more accurate predictive of expected date of delivery (EDD) than that calculated from the first day of last menstrual period (LMP)
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