Reliability of sonographic estimation of fetal weight: A study of three tertiary hospitals in Nigeria
Cletus Uche Eze1, Christopher Chukwuemeka Ohagwu2, Livinus Chibuzo Abonyi1, Nicholas Kayode Irurhe1, Zachaeus Ayo Ibitoye1
1 Department of Radiation Biology, Radiotherapy, Radiodiagnosis and Radiography, Faculty of Clinical Sciences, College of Medicine, University of Lagos, Ishaga Road, Idi-Araba, Surulere, Lagos, Nigeria
2 Department of Medical Radiography, Faculty of Health sciences, College of Medicine, Nnamdi Azikiwe University, Nnewi Campus, Nnewi, Anambra, Nigeria
Cletus Uche Eze
Department of Radiation Biology, Radiotherapy, Radiodiagnosis and Radiography, Faculty of Clinical Sciences, College of Medicine, University of Lagos, Ishaga Road, Idi-Araba, Surulere, Lagos
Context: There is a dearth of sonologists in Nigeria, yet sonographic estimation of actual birth weight (ABW) is important in antenatal care.
Aim: To determine the reliability of estimated fetal weight (EFW) by sonographers and sonologists in Lagos Nigeria.
Settings and Design: In the cross-sectional study, a convenience sample of 663 healthy women with singleton pregnancy at term was selected. Ethical approval for the study design and consent of participants were obtained.
Subjects and Methods: Three sonographers and three sonologists used a single ultrasound scanner with Hadlock-3 algorithm to measure biparietal diameter, abdominal circumference, and femur length in three centers while three midwives used a single neonatal weighing scale to measure ABW.
Statistical Analysis Used: Medical® statistical software version 12.5 was used to analyze data. Descriptive and inferential statistics, as well as Bland/Altman plots were used to determine reliability of EFWs. Results were tested for statistical significance at P ≤ 0.05.
Results: Majority (76.2%) of babies had normal weight while mean EFW and ABW were 3.50 ± 0.10 kg and 3.45 ± 0.12 kg, respectively and the difference between them is not statistically significant (P > 0.05). For sonographers and sonologists in each center, mean error and coefficient of variation were very small while Pearson's correlation coefficient as well as intra- and interclass correlation coefficients was very high.
Conclusion: Independent estimation of ABW by sonographers in Lagos metropolis was very reliable. Sonography was also highly reliable in predicting macrosomia.