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A third important effect of PTH on the kidneys is stimulation of the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol). [221] This form of vitamin D is the active hormone which promotes calcium uptake from the intestine via the action of calbindin. [223] Calcitriol also reduces calcium loss to urine. [220]
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]
In medical practice, a blood test for 25-hydroxy-vitamin D, 25(OH)D, is used to determine an individual's vitamin D status. [11] The name 25(OH)D refers to any combination of calcifediol (25-hydroxy-cholecalciferol), derived from vitamin D 3, and ercalcidiol (25-hydroxy-ergocalciferol), [1] derived from vitamin D 2. The first of these (also ...
Earlier this year, the U.S. Preventive Services Task Force issued updated guidance saying that vitamin, mineral and multivitamin supplements are unlikely to prevent cancer or heart disease, or to ...
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effective in hypercalcemia due to malignancy with elevated vitamin D levels (many types of malignancies raise the vitamin D level). [22] also effective in hypervitaminosis D and sarcoidosis; dialysis usually used in severe hypercalcaemia complicated by kidney failure. Supplemental phosphate should be monitored and added if necessary
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