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Vitamin D Status

Meaning

The clinical measure of the concentration of 25-hydroxyvitamin D (25(OH)D) in the serum, which is the best indicator of the body’s total stores of this crucial fat-soluble secosteroid hormone. Vitamin D status is a vital biomarker, as optimal levels are essential not only for calcium homeostasis and bone health but also for modulating immune function, cell proliferation, and endocrine signaling across numerous tissues. Suboptimal status is a global health concern with systemic implications.