Comparative Study on Estimated Fetal Weight in Labor Using Dare’s and Johnson’ Formula

Abstract

Introduction: There are several methods available to estimate fetal weight. Choosing the

correct method will affect what is appropriate and safe for pregnant women.

Research objectives: The objective of this research was to study the comparing predictions of fetal weight in the labor period using the Dare and Johnson method.

Research methodology: The sample was 200 pregnant women who were gestational age

between 24-41⁺⁶ week and came to give birth in the delivery room of Nong Bua Lam phu Hospital. All sample were given a Dare and Johnson method of fetal body weight prediction and compared to birth weight. Using statistics Exact probability test and P-value estimated from Exact McNemar test. And use to Modified Bland-Altman’s plot

          Results: findings in the case of predicting the fetal weight of not more than 3,500 grams, it was found that the Dare method can estimate fetal weight closer to newborn weight than Johnson method. It has compared to the actual birth weight of ± not more than 200  grams. Statistical Significance (p=0.020). When the newborn weight more than 3,500 grams, both methods can be able to estimate fetal weight close to newborn weight, no different (p=0.503).

Conclusion: The Dare method can be used to assess fetal weight during pregnancy, particularly when it is less than 3,500 grams, as it predict birth weight more accurately the Johnson method.