Comparison of Ultrasonographic Estimated Fetal Weight and Actual Birthweight Performed by Residents in Training at the University Hospital of the West Indies

Objective: To determine the correlation of ultrasonographic estimation of fetal weight and actual birthweight and the impact of the level of resident's training on the results. Methods: This was a prospective study of 90 women with term pregnancies. Ultrasound estimated fetal weight (EFW) was calculated by a pre-programmed Hadlock formula. Days from ultrasound to delivery were less than seven. The EFW was compared to the actual birthweight at delivery. The year of training of the resident that performed the ultrasound was recorded. Exclusion criteria included diabetes mellitus and known fetal anomalies. Results: Mean age was 28 years, parity was 0 to 4 and mean gestational age was 38 weeks. There was an average over-estimation of 64.8 grams. The difference between mean EFW and mean birthweight was not significant (p = 0.067). The difference between mean EFW and mean birthweight when calculated according to year of residency was not significant, p = 0.075 and 0.402 for junior and senior residents, respectively. Conclusion: There is good correlation between residents' ultrasonographic estimation of fetal weight and actual birthweight at the University Hospital of the West Indies. There was no significant difference in correlation between senior and junior residents. Developments in computer technology might contribute to decrease in the learning curve.