Online ISSN: 2515-8260

A comparative study between Johnson formula and Hadlock formula for estimating fetal weight in term gestation – At A Tertiary Care Institute

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Siddhi Fuke 1 , Kiran Patole 1 , Abhijeet Patil 1

Abstract

Background: The perinatal and maternal outcome grossly depends upon the fetal weight at term gestation. In urban setup, ultrasound is easily available for birth weight estimation. In rural setup USG are not easily available and clinical methods are still used for birth weight estimation as it don’t require any costly equipment and they are easy to use and give immediate estimation of expected birth weight. Methods: It is a Hospital based observational study done between August 2019 to December 2021 conducted at the Department of Obstetrics and Gynaecology of Dr Vasantrao Pawar Medial College, hospital and research center, Nashik, Maharashtra. All subjects with singleton pregnancy with reliable gestation scan with no fetal anomalies were included. Estimated fetal weight (EFW) was calculated by Johnson’s formula as clinical method and Hadlock formula using Ultrasound was used. EFW were compared with the actual birth weight. Results: 198 patients were included during the study period. Mean age was 26.65 years; mean Gestational Age (B/D) was 38.63 weeks. Mean EFW by Johnsons formula was 3147.55 gms, mean EFW by Hadlocks formula was 3067.83gms and mean actual birth weight was 2952.07gms. Mean error was 183.4gms in Johnson’s formula and mean error was 317.15gms in Hadlocks formula. Conclusions: Clinical estimation method is as accurate as routine USG estimated in average birth weight. It can be of great value in developing countries like ours, where ultrasound is not available at many health care centers especially in a rural area.

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