. 2015 Mar 26;2015:868961. doi: 10.1155/2015/868961

Table 1.

The difference in characteristics of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D.

	Affinity to vitamin D receptor	Serum total concentration	Half-life	Risk of hypercalcemia
25(OH)D	(1)^∗	9.0–34.0 ng/mL (500)^∗	480 hrs	Low

1,25(OH)₂D	(100–200)^∗	20–60 pg/mL (1)^∗	15 hrs	High

^∗Relative value.