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Indian Journal of Obstetrics and Gynecology Research

Johnson’s formula to compare fetal weight with actual birth weight

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Research Article

Author Details : Kashish Sehrawat*, Tushar Madhav Panchanadikar

Volume : 7, Issue : 2, Year : 2020

Article Page : 147-152

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Introduction: Accurate fetal weight assessment is a problem which is associated where resources
are subject to availability. Both low and high birth weight is connected with augmented prospect of
complications of new born during labour and purperium. Fetal weight assessment can reduce the risk of
complications that are challenging in maternal and neonatal of Symphysio-fundal height measurement by
adopting Johnson’s Formula. For the fetal weight estimation a method that has now come to be prevalent.
By adopting Johnson’s formula along with its comparison to the actual birth weight. The present study thus
aimed to determine fetal weight accuracy.
Materials and Methods: Present study of prospective analytical was accepted to in the Obstetrics and
Gynaecology Department of a tertiary care hospital in Pune. Study included a total of 500 pregnant women
attending the OPD with full term pregnancy till onset of labour, fulfilling the inclusion criteria. Adopting
Johnson’s formula birth weight estimation has been done along with the results were correlated with definite
birth weight. Using SPSS ver. 21.0 the analysis of Data had been performed.
Results: As per the prediction of Mean birth weight by clinical (Johnson’s formulae) and actual birth
weight was 3.13 Kg and 2.89 Kg correspondingly. Johnson’s formulae’s co-relates well with actual birth
weight (r-0.86; 95% CI: 0.84-0.88), though prediction of fetal weight was slightly on a higher side. In
60.8% cases the difference was within range of 10% and in 84.8% the difference was less than 15%. The
mean difference in estimation was highest in babies those are in low birth weight i.e. <2> Conclusion: Our observation indicates that as a diagnostic tool there is visibly a role for clinical birthweight
estimation, in a pregnancy term suggesting that, to manage labour as well as delivery clinical estimation is

Keywords: Birth weight, Birth weight estimation, Johnson’s formulae, Symphysio-fundal height.

Doi : 10.18231/j.ijogr.2020.031

How to cite : Sehrawat K, Panchanadikar T M, Johnson’s formula to compare fetal weight with actual birth weight. Indian J Obstet Gynecol Res 2020;7(2):147-152

Copyright © 2020 by author(s) and Indian J Obstet Gynecol Res. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC-BY-NC 4.0) (