calcidiol


calcidiol
25-Hydroxycholecalciferol (a 3,25-diol); the first step in the biologic conversion of vitamin D3 to the more active form, calcitriol; it is more potent than vitamin D3. SYN: 25-hydroxycholecalciferol, calcifediol.
- c. 1α-hydroxylase, 25-hydroxycholecalciferol 1α-hydroxylase the monooxygenase that forms calcitriol from c. using O2 and NADPH; a deficiency in this enzyme can result in features of a vitamin D deficiency.

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cal·ci·di·ol (kal″sĭ-diґol) 25-hydroxycholecalciferol.

Medical dictionary. 2011.

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