Normal Cephalic Index Size on Obstetric Ultrasound
The normal fetal cephalic index ranges from 75–85 on obstetric ultrasound, helping detect head shape abnormalities that affect biometric accuracy.
Fetal Biometry
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Normal Thorax/Abdomen Circumference Ratio on Ultrasound
Normal fetal thorax circumference to abdomen circumference ratio is >0.77 on ultrasound, a key marker for detecting thoracic dysplasia.
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