Diagnostic approach to calcipenic (hypocalcemic) rickets

Calcipenic rickets is sometimes termed "hypocalcemic rickets," but this term is not completely accurate, because serum calcium is not always low in this disorder. Calcipenic rickets is most commonly caused by dietary vitamin D deficiency. Calcipenic rickets also may be caused by a mixed deficiency of dietary vitamin D and calcium.

* 1-alpha-hydroxylase deficiency (previously called vitamin D-dependent rickets type I or pseudo-vitamin D deficiency) is characterized by defective conversion of 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D.
¶ Hereditary resistance to vitamin D (previously called vitamin D-dependent rickets type II) is a rare disorder characterized by end-organ resistance to vitamin D, usually caused by a defect in the vitamin D receptor.

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Diagnostic approach to calcipenic (hypocalcemic) rickets