[Ultrasound macrosomic fetal weight estimation formula using maternal weight measurements]

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Fetal Medicine

Background:

• Traditional methods for estimating macrosomic fetal weight have significant errors.
• Fetal ultrasound measurements and maternal characteristics may improve prediction accuracy.

Purpose of the Study:

• To evaluate a new logarithmic formula for estimating fetal weight.
• To compare the accuracy of the new formula against commonly used formulas for fetal macrosomia prediction.

Main Methods:

• Ultrasound fetal weight estimation was performed on 113 singleton fetuses within one week of delivery.
• A new logarithmic formula by Hart et al. using fetal biometry and maternal weight was compared with Shepard, Campbell, and Hadlock formulas.
• Exclusion criteria included multiple pregnancies, intrauterine deaths, and abnormalities.

Main Results:

• The new Hart formula achieved the lowest Mean Percentage Error (MPE) of -0.74% and Mean Absolute Percentage Error (MAPE) of 3.38%.
• Compared to other formulas, the Hart formula showed statistically significant lower MPE and MAPE.
• 84% of estimated fetal weights were within +/- 5% of actual birth weight using the new formula.

Conclusions:

• The proposed ultrasound formula provides more precise estimation of macrosomic fetal weight.
• The new formula demonstrates superior accuracy with the lowest MPE and MAPE.
• This formula may be beneficial for clinical use when fetal macrosomia is suspected.