Vitamin D refers to a group of fat-soluble, structurally similar sterols that act as hormones in the body. The most common forms of Vitamin D are D2 and D3, both of which are important for calcium absorption and bone health.
To assess Vitamin D status, the 25-hydroxyvitamin D (25(OH)D) test is typically used, as it most accurately reflects the body's Vitamin D stores. In cases of renal disease or hypercalcemia, testing for 1,25-dihydroxyvitamin D (DHVD) may be necessary for a more comprehensive assessment of Vitamin D status.
The 25(OH)D test is generally considered the best initial test to evaluate Vitamin D levels, as it provides a clear indication of the body's overall Vitamin D reserves.
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