Disproportion between head size and abdominal size can indicate asymmetrical growth restriction, often linked to placental insufficiency. A head circumference that falls within the expected percentile range suggests normal brain growth and structural development.
Low HC Head Circumference as a Key Indicator of Microcephaly
Measurement Technique and Protocol Obtaining an accurate head circumference measurement requires adherence to standardized ultrasound protocols. The caliper points are placed on the outer edge of the skull bone on one side and the inner edge of the skull on the opposite side.
The brain grows rapidly during the second and third trimesters, and the size of the head reflects this neurological maturation. HC in fetal biometry refers to the head circumference measurement, a fundamental parameter used during prenatal ultrasound to assess fetal growth and development.
Low Head Circumference HC: Understanding Microcephaly Indicators
These charts are derived from large population studies and help determine whether the fetal head size is appropriate for the current gestational age. It is analyzed in conjunction with abdominal circumference (AC) and femur length (FL) to calculate the estimated fetal weight (EFW).
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