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Comparative study of fetal weight estimation by clinical (Johnson's Rule) and Ultrasonographic methods (Hadlock's Method) and its correlation with actual birth weight: A Two-year retrospective study at Jose R. Reyes Memorial Medical Center.


Ma. Theresa S. Acosta

Related Institution

Department of Obstetrics and Gynecology - Jose R. Reyes Memorial Medical Center

Publication Information

Publication Type
Research Project


General Objective:

To compare the accuracy of fetal weight estimation using Johnson's Rule Formula and Ultrasonographic method (Hadlock's Method) and its correlation with actual birth weight in patients beyond 37 weeks age of gestation admitted at the Obstetrics and Gynecology ward.

Specific Objectives:

1.  To determine the demographics of patients included in the study.

2.  To assess the fetal weight in term pregnancies using the Johnson's Rule Formula and ultrasonographic estimation (Hadlock's Method).

3.  To determine the degree of positive and negative estimation value of Johnson's formula and Hadlock's Method for the estimation of fetal weight.

4.  To determine the degree of error using Johnson's Rule Formula and Hadlock's Method of fetal weight.

5.  To identify the best method in estimating the fetal weight beyond 37 weeks age of gestation.



Hadlock's method is the best method to estimate the actual birth weight.  The degree of error is significantly lesser compared to Johnson's formula at specific birth weight ranges.  It did not indicate any significant difference when compared to the actual birth weight.  Finally, it can account for more than 50% of the variations int he actual birth weight.  Even though Johnson's formula is significantly correlated to the actual, its effect on the actual birth weight is so small (3.9%) compared to the effect of Hadlock's method (57.3%).


1. Nakaporntham, Phisakthongswatwong . "Symphysis fundal height measurements in prediction of birthweight" Thai J Obstet Gynecol 18, 126-33, 2010. Retrieved from: http://https://www.tci-thaijo.org/index.php/tjog/article/view/1357
2. Mohanty, C , Das, B K, Mishra, O P. "Parturient fundal height as a predictor of low birth weight" J Trop Pediatr 44, 222-4, 1998. Retrieved from: http://https://www.ncbi.nlm.nih.gov/pubmed/9718908

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Jose R. Reyes Memorial Medical Center Library Abstract Print Format

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