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Sonographic fetal weight estimation using femoral length: Honarvar equation
Raziah Dehghani Firoozabadi1, Nasrin Ghasemi, Mehdi Dehghani Firoozabadi
1Obestetric and Gynecology Department, Infertility and Treatment Centre, Yazd Shahid Sadoughi Medical Sciences University, Yazd, Iran.
Annals of Saudi Medicine
|June 15, 2007
Summary
The Honarvar 2 equation accurately estimates fetal weight using femur length in Iranian fetuses. This method is reliable and recommended for clinical use, regardless of maternal or neonatal factors.
Area of Science:
- Perinatal Medicine
- Medical Imaging
- Biostatistics
Background:
- Fetal growth is influenced by multiple factors and can be assessed using ultrasound.
- Fetal femur length serves as a key metric for estimating fetal weight, acknowledging racial variations in growth patterns.
Purpose of the Study:
- To evaluate the accuracy of the Honarvar 2 equation for estimating fetal weight in a specific ethnic population.
- To determine the correlation between estimated fetal weight (EFW) and actual birthweight.
Main Methods:
- Prospective study of 500 pregnant women at 36 weeks gestation.
- Real-time sonography to measure fetal femur length.
- Fetal weight estimated using the Honarvar 2 equation; validated with Pearson correlation and multiple regression.
Main Results:
- The Honarvar 2 equation showed a significant correlation with actual birthweight, confirming its validity for fetal weight estimation.
- The equation's accuracy was independent of maternal age, BMI, neonate sex, and parity.
Conclusions:
- Ethnicity is a significant factor in fetal weight estimation accuracy.
- The Honarvar formula provides the most accurate EFW for Iranian fetuses and is recommended for use.
