Fetal Head Normal Measurements

Fetal Head Cephalic index: BPD / OFD x 100; normal range: 70-86 BPD correction formula √BPDxOFD/1.24 or BPD+OFD/2.25 Head Circumference = (BPD + OFD) x 1.57 Normal Nuchal Fold Thickness <6mm, 6mm or greater is considered a hard marker for chromosomal abnormality, valid to 20 weeks. Lateral ventricle Normal <10mm

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