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Conditional centiles for the quantification of fetal growth
1Department of Obstetrics and Gynaecology, Ninewells Hospital and Medical School, Dundee, UK.
Summary
This study introduces conditional centiles for fetal growth, enabling accurate tracking of fetal size over time using serial ultrasounds. These centiles provide expected ranges for fetal dimensions at later gestational ages, aiding in monitoring low-risk pregnancies.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Medical Imaging
Background:
- Accurate fetal growth assessment is crucial for monitoring pregnancy.
- Existing fetal growth charts may not fully capture individual fetal growth trajectories.
- Longitudinal data allows for personalized growth evaluation.
Purpose of the Study:
- To develop conditional centiles for fetal biometric measurements.
- To enable prediction of expected fetal dimensions at later gestational ages.
- To facilitate the evaluation of time-dependent fetal growth changes.
Main Methods:
- Serial ultrasound examinations in 274 low-risk pregnancies.
- Measurement of biparietal diameter, fetal abdominal area, femur length, and estimated fetal weight.
- Construction of conditional centiles based on longitudinal data.
Main Results:
- Conditional centiles were constructed for key fetal biometric parameters.
- These centiles allow extrapolation of expected fetal dimensions at future gestational ages.
- Examples of conditional centiles with 4-week intervals are provided.
Conclusions:
- Conditional centiles offer a novel method for quantifying fetal growth.
- This approach enhances the evaluation of dynamic changes in fetal dimensions.
- The method supports more precise monitoring of fetal development in low-risk pregnancies.