Define Criteria for Assessment of Vitamin D Status?

You may recall the events involved in calcium homeostasis described earlier in this section. We studied that sufficient 25-OH-D must be available to provide adequate steroid hormone 1,25-dihydroxycholecalciferol (1,25-(OH)2D) synthesis  and hence an adequate level of plasma calcium. It becomes evident therefore, that vitamin D status can be assessed by measuring the circulating level of the steroid hormone 1, 25-dihydroxycholecalc$erol. Plasma levels of 3-6 mg/dl are considered normal.