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Head circumference and biparietal diameter z-score calculator

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Chitty et al. 

Charts of fetal size: 2. Head measurements 

British Journal of Obstetrics and Gynaecology, 1994, Vol. 101, pp. 35-43



The above paper defines reference ranges for fetal head circumference and biparietal diameter measurement. This calculator allows you calculate the Z scores for these measurements, which may be helpful in the diagnosis of microcephaly.

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