Which form of vitamin D is considered inactive?

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Multiple Choice

Which form of vitamin D is considered inactive?

Explanation:
The inactive form is 25-hydroxyvitamin D3, known as calcidiol. After vitamin D enters the body, the liver converts it to calcidiol, which circulates in the blood mainly as a storage form and has little direct hormonal activity. The kidney then converts calcidiol to the active hormone, 1,25-dihydroxyvitamin D3 (calcitriol), which binds the vitamin D receptor and regulates calcium and phosphate balance. Clinically, we measure 25(OH)D to assess vitamin D status because it reflects overall stores, while 1,25(OH)2D levels are tightly regulated and not reliable for indicating deficiency.

The inactive form is 25-hydroxyvitamin D3, known as calcidiol. After vitamin D enters the body, the liver converts it to calcidiol, which circulates in the blood mainly as a storage form and has little direct hormonal activity. The kidney then converts calcidiol to the active hormone, 1,25-dihydroxyvitamin D3 (calcitriol), which binds the vitamin D receptor and regulates calcium and phosphate balance. Clinically, we measure 25(OH)D to assess vitamin D status because it reflects overall stores, while 1,25(OH)2D levels are tightly regulated and not reliable for indicating deficiency.

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