Estimation of Fetal Weight by Johnson’s Formula and Its Correlation with Actual Birth Weight
Journal Title: Scholars Journal of Applied Medical Sciences - Year 2015, Vol 3, Issue 7
Abstract
Fetal growth assessment is an important part of antenatal care. Proper estimation of fetal weight and appropriate timed intervention in cases of intrauterine growth restriction (IUGR) can help to decrease the perinatal morbidity and mortality. A prospective study of 100 antenatal women at 40weeks of gestation attending the antenatal outpatient department (OPD) and admitted in the antenatal wards was selected for the study. Only those women with a singleton pregnancy in vertex presentation, who are sure of their LMP and in whom congenital anomalies and liquor volume abnormalities have been ruled out by ultrasonography (USG) were included in the study. The fetal weight is calculated by using Johnson’s formula and is compared with the USG weight, and the accuracy was determined by comparing with the actual birth weight. The Johnson’s formula was seen to overestimate the fetal weight at birth weights less than 3 kg, and above it the results were almost correlating with the birth weight. The difference between the fetal weight calculated by Johnson’s formula and the actual birth weight was found to be statistically insignificant. (p=0.602). The Johnson’s formula for estimation of fetal weight is as accurate as USG and can serve as an important tool for fetal weight estimation especially in low resource setting where USG is not available. Keywords: Symphysio fundal height, Johnson’s formula, birth weight, ultrasonography, IUGR, fetal growth.
Authors and Affiliations
Dr. Jili Basumatary, Dr. Ashish Kumar Bhattacharjee, Dr. Shaidul Islam Borah
Keywords
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