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Fetal Biparietal diameter

Landmarks
1. Thalamic nuclei
2. Cavum septi pellucidi
Technique
1. Oval shape
2. Leading edge to leading edge
Images
Hints
1. Avoid too much abdominal prEssure
2. Look for Symmetric intracranial anatomy
3. Look for X
Accuracy
1. At 20 weeks gestation: accuracy within 1 week

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This page was written by Scott Moses, MD, and was last revised 1/13/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 5.0.