Ultrasonographic study of relationship between fetal biparietal diameter and gestational age
Journal Title: Applied Physiology and Anatomy Digest - Year 2018, Vol 2, Issue 4
Abstract
Background: Measurements of foetal developmental parameters like bi-parietal diameter, abdominal circumference, head circumference, femur length are important in light of variations in ovulation, menstrual irregularities and practical clinical difficulties like decision making for premature induction of labour. The present study is done to evaluate fetal biparietal diameter as a parameter to predict the fetal gestational age & to develop a regression equation from its measurement. Material and Method: It is a prospective cross sectional study. A sample size of 404 women from age group 18 to 34 years with singleton uncomplicated pregnancies with sound knowledge about their menstrual dates attending ANC clinic for routine ultrasound fetal biometry was selected for the study. The data collected for fetal biparietal diameter (in cm) was tabulated according to the gestational age from 13 to 42 weeks. Statistical mean and standard deviation of biparietal diameter for each week were calculated. Simple linear regression analysis of the observations was done for estimating gestational age (G.A.) from the measurements of biparietal diameter (BPD) and regression equations were developed separately for 2nd and 3rd trimester. The study establishes the relationship of the biparietal diameter in centimeters, with the advancing gestational age in weeks. Observations & Results: Interpretation of the data shows that the biparietal diameter gradually increased from 13 weeks to 36 weeks of gestation. Normograms for biparietal diameter can be constructed by the regression equation derived by this study for central india population. These normograms can be used to determine whether a given biparietal diameter is normal or abnormal for a particular gestational age. Conclusion: The study establishes a linear and direct relationship between the biparietal diameter and the gestational age .The regression equation developed from measurements of biparietal diameter can be an important additional parameter for estimating gestational age along with other parameters.
Authors and Affiliations
Dr. Rahul Paliwal
Keywords
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