Table 1.

Means and Normal Ranges of Vitamin D Metabolites

	No.	25‐OH‐D3	24,25‐(OH)2D3	Ratio	25‐OH‐D3‐26,23‐lactone	1α,25‐(OH)2D3	1α,24,25‐(OH)3D3
		(ng/mL)	(ng/mL)	25‐OH‐D3/24,25‐(OH)2D3	(ng/mL)	(pg/mL)	(pg/mL)
25‐OH‐D >20	84	35.4 ± 19.4	2.88 ± 1.90	12.8 ± 4.5	0.089 ± 0.069	32.0 ± 10.8	9.1 ± 3.8
25‐OH‐D <20	79	11.7 ± 5.2	0.47 ± 0.30	31.9 ± 15.9	0.038 ± 0.021	36.5 ± 12.6	5.7 ± 3.4
25‐OH‐D‐all	163	24.7 ± 18.9	1.79 ± 1.86	21.4 ± 14.7	0.070 ± 0.06	33.8 ± 11.8	7.6 ± 3.9
95% interval	163	5.6–70.7	0.15–5.60	7.7–55.1	0.015–0.195	16.2–53.9	2.1–15.5

Values were taken from normal individuals with 25‐OH‐D >20 or <20 ng/mL from studies in Nebraska, USA; France; and Germany, published by Kaufmann et al.^{( 8 )}