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Fetal weight estimation in twin pregnancies
N J Secher1, A Tøttrup, H Djursing
1Department of Obstetrics and Gynaecology, Aarhus Kommunehospital, University of Aarhus, Denmark.
European Journal of Obstetrics, Gynecology, and Reproductive Biology
|September 1, 1989
Summary
Ultrasound measurements of biparietal diameter and abdominal diameter accurately estimate fetal weight in twin pregnancies. This method shows reliable prediction accuracy, with most birth weights deviating less than 15% from estimated fetal weight.
Area of Science:
- Perinatology
- Medical Imaging
- Obstetrics
Background:
- Accurate fetal weight estimation is crucial for managing twin pregnancies.
- Ultrasound biometry is a standard method for assessing fetal growth.
Purpose of the Study:
- To evaluate the accuracy of ultrasound-derived fetal weight estimation in twin pregnancies.
- To assess the prediction error of a specific fetal weight formula.
Main Methods:
- Ultrasound measurements of biparietal diameter (BPD) and abdominal diameter (AD) were taken in 154 twin pregnancies.
- Fetal weight was estimated using the formula (0.0108 X AD^1.72 X BPD^0.99) within 0-4 days of delivery.
- Comparison of estimated fetal weight with actual birth weights.
Main Results:
- Fetal weight estimation was successful in 84% of examined twins.
- 60% of birth weights were within 10% of estimated fetal weight; 83% were within 15%.
- Prediction error remained consistent across different fetal weight groups, averaging 8.5-9.8%.
Conclusions:
- Ultrasound biometry provides a reliable method for estimating fetal weight in twin pregnancies.
- The applied formula demonstrates good predictive accuracy for birth weights.
- This technique aids in clinical management and monitoring of twin gestations.