Fetal Head Normal Measurements

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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


.... Go back to normal sonographic measurements
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