Keywords
Birth weight Measurement - 5D Long Bone - VOCAL
Abstract
Objective:
To assess the accuracy of 5D automated measurements of long bones, three dimensional VOCAL measurement of fetal thigh volume in prediction of fetal weight in comparison to the conventional two dimensional Hadlock formulas.
Methods:
Fifty pregnant women with singleton pregnancy at 37 to 41 weeks of gestation admitted for planned delivery within 48 hours were enrolled. All patients were examined by 2D, 3D VOCAL and 5D long bones for the purpose of estimating the fetal weight. Each technique was performed by the same examiner for all the patients who were blinded to the results of the two other techniques. Results were compared to actual birth weights using a unified weight scale. The accuracy, precision and agreement between the three types of ultrasound were calculated as well the time needed to perform each technique.
Results:
2D estimated fetal weight was significantly less accurate than 3D estimated fetal weight as measured by absolute birth weight estimation error and percent birth estimation error. On the other hand comparing the accuracy of 5D to 3D ultrasound showed a statistical significance in favor of the 5D but the difference was so small to impose a clinical significance in obstetric practice.
Conclusion:
Three dimensional ultrasonographic measurement of fetal thigh volume is more accurate than two dimensional Hadlock formulae in fetal weight estimation in our population. The new 5D automated long bone represent a faster, more convenient and accurate method for assessment of birth weight.
Citation
Nossair WS. The Reproducibility of 5D Long Bone versus VOCAL 3D and Conventional 2D Weight Formulae in Measurement of Birth Weight. SM J Gynecol Obstet. 2017; 3(1): 1019.