The Hadlock 3 equation is a specific formula used in obstetrics for estimating fetal weight via ultrasound. According to the available sources, the Hadlock 3 formula utilizes measurements from the fetus, specifically the head circumference (HC), abdominal circumference (AC), and femur length (FL), to provide a reliable estimation of fetal weight.

The mathematical representation of the Hadlock 3 formula is as follows: [ \log_{10}(\text{Weight}) = 1.335 - 0.0034 \times \text{AC} \times \text{FL} + 0.0316 \times \text{BPD} + 0.0457 \times \text{AC} + 0.1623 \times \text{FL} ]

This equation combines different ultrasound measurements to generate an estimated fetal weight (EFW), making it a crucial tool during pregnancy assessments, particularly after the 24-week mark. The accuracy of this estimation is supported by various studies, showing that it tends to have less error compared to other estimations, as noted in a systematic review published on the accuracy of these formulas.

For more information on this topic or related tools for estimating fetal weight, you can view the following links:

• Estimation of Fetal Weight - Perinatology.com
• Fetal Growth Calculator
• Clinical estimation comparison
• Intergrowth standards PDF
• Fetal weight estimation article
• Hadlock's formulas comparison
• Prospective verification of estimators article

These resources provide more in-depth insights into the Hadlock formulas and their effectiveness in estimating fetal weight.

Sources

Estimation of Fetal Weight - Perinatology.comFetal Growth CalculatorClinical versus Sonographic Estimation of Foetal Weight in ...[PDF] The Intergrowth standards for Hadlock's estimation of fetal weightFetal weight estimation by automated three-dimensional limb ...Estimation of fetal weight using Hadlock's formulasProspective verification of sonographic fetal weight estimators ...

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