Keywords : Johnson’s formula
European Journal of Molecular & Clinical Medicine,
2022, Volume 9, Issue 3, Pages 12131-12136
Background: The aim of a good obstetrician is to give a healthy baby to a healthy mother. The perinatal and maternal outcome grossly depends upon fetal weight at term gestation. The present study was undertaken to made a comparative evaluation of fetal weight estimation in term pregnancy using Abdominal girth x Symphysis fundal height (Insler’s Formula), Johnson’s formula, and Hadlock’s formula using ultrasonography.
Material and Methods: Present study was single-center, prospective, comparative study, conducted in pregnant women attending antenatal clinics and maternity wards, with term, Singleton pregnancy, Cephalic presentation, had their last USG done within one week prior to delivery.
Results: The mean birth weight by symphysiofundal height * abdominal girth ± SD was 2948.90 ± 325.90 whereas mean birth weight by actual birth weight method ± SD was 2924.88 ± 360.52, difference was statistically not significant. Difference between mean birth weight by Johnson’s formula (3277.23 ± 399.60) was statistically significant as compared to mean actual birth weight (2924.88 ± 360.52). Difference between mean birth weight by Hadlock’s formula (3013.65 ± 390.77) was statistically significant as compared to mean actual birth weight (2924.88 ± 360.52). Birth weight calculated by SFH*AG in 45.3% of cases, by Johnson’s formula in 80.6% of cases and by Hadlock’s formula in 60% of cases was overestimated. Birth weight calculated by SFH*AG in 54.7% of cases, by Johnson’s formula in 19.4% of cases and by Hadlock’s formula in 40 % of cases was under estimated. Conclusion: AG x SFH clinical formula can be of great value in a developing country like ours, where ultrasound is not available at many health care delivery systems.