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Innovative Resources for Fractional Limb Volume, Fetal Echocardiography, and Individualized Growth Assessment
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EFW Calculator
EFW Using 2D Biometry with Fractional Limb Volume
New fetal weight estimation models have been finalized and this calculator allows the user to enter sonographic measurements for EFW that is based on 2D and 3D parameters.
Growth Parameters
BPD - Biparietal Diameter (cm):
AC - Abdominal Circumference (cm):
FDL - Femoral Diaphysis Length (cm):
AVol - Fractional Arm Volume (mL):
TVol - Fractional Thigh Volume (mL):

 
Prediction ModelsFetal Weight (g)
Original Hadlock Model (AC, FDL)
Log EFW = 1.3598+0.051(AC)+0.1844(FDL)-0.0037(AC)(FDL)
Hadlock FP, Harrist RB, Carpenter RJ, Deter RL, Park SK. Radiology 1984;150:535-40.
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Original Hadlock Model (BPD, AC, FDL)
Log EFW = 1.4787-0.003343(AC)(FDL)+0.001837(BPD)(BPD)+0.0458(AC)+0.158(FDL)
Hadlock FP, Harrist RB, Carpenter RJ, Deter RL, Park SK. Radiology 1984;150:535-40.
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Modified Hadlock Model (AC, FDL)
Log EFW = 1.2487+0.055(AC)+0.1987(FDL)-0.0043(AC)(FDL)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Modified Hadlock Model (BPD, AC, FDL)
Log EFW = 1.4035-0.0037(AC)(FDL)+0.0027(BPD)(BPD)+0.0441(AC)+0.177(FDL)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 1 (AVol)
Ln EFW = 4.9588-0.0526(Ln AVol)(Ln AVol)+1.0721(Ln AVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 2 (AC,AVol)
Ln EFW = -3.6138-0.4959(Ln AC)(Ln AC)+4.6761(Ln AC)+0.3795(Ln AVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 3 (BPD,AC,AVol)
Ln EFW = 0.5046-0.304(Ln BPD)(Ln BPD)+1.9665(Ln BPD)+0.9675(Ln AC)+0.3557(Ln AVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 4 (TVol)
Ln EFW = 4.7806+0.7596(Ln TVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 5 (AC,TVol)
Ln EFW = 2.1264+1.1461(Ln AC)+0.4314(Ln TVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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Derivation Model 6 (BPD,AC,TVol)
Ln EFW = -0.8297-0.782(Ln BPD)(Ln BPD)+4.0344(Ln BPD)+0.7853(Ln AC)+0.0528(Ln TVol)(Ln TVol)
Lee W, Balasubramaniam M, Deter RL, Yeo L, Hassan SS, Gotsch F, Kusanovic JP, Goncalves LF, Romero R. New fetal weight estimation models using fractional limb volume. Ultrasound Obstet Gynecol, in press.
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