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  2. Vitamin D deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D_deficiency

    Serum level of 25(OH)D is the laboratory test ordered to indicate whether or not a person has vitamin D deficiency or insufficiency. [53] It is also considered reasonable to treat at-risk persons with vitamin D supplementation without checking the level of 25(OH)D in the serum, as vitamin D toxicity has only been rarely reported to occur.

  3. Calcifediol - Wikipedia

    en.wikipedia.org/wiki/Calcifediol

    Although vitamin D deficiency is common in some populations including those living at higher latitudes or with limited sun exposure, the 25(OH)D test is not usually requested for the entire population. [15] Physicians may advise low risk patients to take over-the-counter vitamin D supplements in place of having screening. [15]

  4. Vitamin D - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D

    Serum 25(OH)D concentration is used as a biomarker for vitamin D deficiency. Units of measurement are either ng/mL or nmol/L, with one ng/mL equal to 2.5 nmol/L. There is no consensus on defining vitamin D deficiency, insufficiency, sufficiency, or optimal for all aspects of health. [19]

  5. 24,25-Dihydroxycholecalciferol - Wikipedia

    en.wikipedia.org/wiki/24,25-Dihydroxycholecalciferol

    24,25-dihydroxyvitamin D 3 is formed from 25-hydroxyvitamin D 3 by the action of CYP24A1 (25-hydroxyvitamin D3-24-hydroxylase). CYP24A1 appears to be "a multicatalytic enzyme catalyzing most, if not all, of the reactions in the C-24/C-23 pathway of 25-OH-D 3 metabolism."

  6. Calcitriol - Wikipedia

    en.wikipedia.org/wiki/Calcitriol

    The 1-hydroxy group is in the alpha position, and this may be specified in the name, for instance in the abbreviation 1α,25-(OH) 2 D 3. [6] Calcitriol is, strictly, the 1-hydroxylation product of calcifediol (25-OH vitamin D 3), derived from cholecalciferol (vitamin D 3), rather than the product of hydroxylations of ergocalciferol (vitamin D 2).

  7. 25-Hydroxyvitamin D 1-alpha-hydroxylase - Wikipedia

    en.wikipedia.org/wiki/25-Hydroxyvitamin_D_1...

    25-Hydroxyvitamin D 1-alpha-hydroxylase (VD 1A hydroxylase) also known as calcidiol 1-monooxygenase [5] or cytochrome p450 27B1 (CYP27B1) or simply 1-alpha-hydroxylase is a cytochrome P450 enzyme that in humans is encoded by the CYP27B1 gene. [6] [7] [8]

  8. Cholecalciferol - Wikipedia

    en.wikipedia.org/wiki/Cholecalciferol

    It is converted to its active form by two hydroxylations: the first in the liver, by CYP2R1 or CYP27A1, to form 25-hydroxycholecalciferol (calcifediol, 25-OH vitamin D 3). The second hydroxylation occurs mainly in the kidney through the action of CYP27B1 to convert 25-OH vitamin D 3 into 1,25-dihydroxycholecalciferol ( calcitriol , 1,25-(OH) 2 ...

  9. Vitamin deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_deficiency

    Vitamin D deficiency: Usually asymptomatic, causes reduce bone density (osteomalacia), rickets, myopathy, and is associated with the development of schizophrenia. It is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D (25(OH)D) in plasma, which is the most accurate measure of stores of vitamin D in the body ...