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Original ArticleOpen Access
Comparison of the Accuracy of Ultrasonic Fetal Weight Estimation by Using the Various Equations
Ratanasiri T 
,
Jirapornkul S ,
Somboonporn W ,
Seejorn K ,
Patumnakul P
,
Jirapornkul S ,
Somboonporn W ,
Seejorn K ,
Patumnakul P SUNGWAL JIRAPORNKUL, M.D.*,
KANOK SEEJORN, M.D.*,
Objective: To compare the accuracy of ultrasonic fetal weight estimation using the Hadlock's,
Shepard's, Tongsong' s and Hansmann's equations.
Material and Method :The analytical-cross sectional study was conducted on 102 pregnant
women who were admitted for delivery in the Labor Room at Srinagarind Hospital, Faculty of Medi-
cine, Khon Kaen University between January I, 1999 and June 30, 1999. The fetal parameters,
including biparietal diameter, abdominal circumference, transverse trunk diameter and femur length,
were measured by ultrasound. The estimated fetal weight was calculated by those four equations. The
mean absolute error was calculated from the absolute of the difference between the estimated fetal
weight and the actual birth weight.
Results : The mean absolute error and standard deviation of the estimated fetal weight by
the Hadlock's, Shepard's, Tongsong's and Hansmann's equations were 8.09
เธ‘
4.18, 7.94
เธ‘
4.63,
7.77
เธ‘
3.70 and 7.83
เธ‘
4.35 per cent respectively and there were no statistically significant differences
at 95 per cent confidence interval (p>0.05).
Conclusion : Apart from having comparable accuracy in the estimation of fetal weight to
those of Hadlock, Shepard and Tongsong, Hansmann's equation employed at Srinagarind Hospital
was more convenient to use than the others.
Key word : Fetal Weight Estimation, Ultrasound, Hansmann's Equation
KANOK SEEJORN, M.D.*,
Objective: To compare the accuracy of ultrasonic fetal weight estimation using the Hadlock's,
Shepard's, Tongsong' s and Hansmann's equations.
Material and Method :The analytical-cross sectional study was conducted on 102 pregnant
women who were admitted for delivery in the Labor Room at Srinagarind Hospital, Faculty of Medi-
cine, Khon Kaen University between January I, 1999 and June 30, 1999. The fetal parameters,
including biparietal diameter, abdominal circumference, transverse trunk diameter and femur length,
were measured by ultrasound. The estimated fetal weight was calculated by those four equations. The
mean absolute error was calculated from the absolute of the difference between the estimated fetal
weight and the actual birth weight.
Results : The mean absolute error and standard deviation of the estimated fetal weight by
the Hadlock's, Shepard's, Tongsong's and Hansmann's equations were 8.09
เธ‘
4.18, 7.94
เธ‘
4.63,
7.77
เธ‘
3.70 and 7.83
เธ‘
4.35 per cent respectively and there were no statistically significant differences
at 95 per cent confidence interval (p>0.05).
Conclusion : Apart from having comparable accuracy in the estimation of fetal weight to
those of Hadlock, Shepard and Tongsong, Hansmann's equation employed at Srinagarind Hospital
was more convenient to use than the others.
Key word : Fetal Weight Estimation, Ultrasound, Hansmann's Equation
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