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EFW (Hadlock)

Hadlock EFW Model (4-Param)

Hadlock's Model 4 (BPD, HC, AC, FL) is widely considered the most accurate for Western fetal demographics.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Primary Clinical Uses

Baseline fetal weight estimation across the 2nd and 3rd trimesters
Screening for Fetal Growth Restriction (FGR / SGA) via mapping to growth charts
Assessing likelihood of macrosomia in diabetic pregnancies or post-dates

Last Comprehensive Review: 2026