A COMPARATIVE CROSS-SECTIONAL STUDY OF CLINICAL AND ULTRASONOGRAPHIC ESTIMATION OF FETAL WEIGHT AT DELTA STATE UNIVERSITY TEACHING HOSPITAL, OGHARA
Background: Neonatal outcome is dependent on birth weight. Accurate prediction of fetal weight is central to neonatal survival. Both clinical and ultrasonographic estimation usingDare’s and Hadlock formula respectively are in common use. This study will compare bothequations to identify the more accurate method.
Aim: This study compared indices of validity of clinical and ultrasonographic methods of fetal weight estimation at term.
Objectives: The objectives were to determine the indices of validity of Dare’s formula andHadlock’s ultrasound formula, and determine which of the two methods better predicted actual birth weight.
Research Methods: This was an observational comparative study that was conducted at DELSUTH, Oghara over a period of 4 months. It compared the indices of validity of Dare’sformula and Hadlock equation in the estimation of birth weights at term.
Handling of results: The data obtained was collated, coded and analysed using Statistical package for social scientists (SPSS) 21(IBM, Chicago, USA); and results are presented in tables and figures. Accuracy of birth weight estimation for low, normal and large birth weight categories, and for both birth weight estimation methods were derived by calculating percentage errors, absolute percentage error and ratio by percentage of estimates within 10% of actual birth weight. Results will serve as basis for recommendation of a better technique for fetal weight estimation.
Strengths and limitations: The same investigator made measurements for both clinical and ultrasound estimations of fetal weight, therefore inherent bias could not be excluded. Good clinical methods and taking the average of two measurements however minimized bias. The fetuses may also have gained more weight at varying extents during the estimation-delivery interval, no adjustments were however made for any such probable weight change.
Key words: estimated fetal weight, Dare’s formula, Hadlock’s formula, ultrasound