Table 1.

Serum 25-Hydroxyvitamin D [25(OH)D] concentrations and health*. From [7•]

nmol/L**	ng/mL*	Health status
< 30	< 12	Associated with vitamin D deficiency, leading to rickets in infants and children and osteomalacia in adults
30 to 50	12 to 20	Generally considered inadequate for bone and overall health in healthy individuals
> 50	> 20	Generally considered adequate for bone and overall health in healthy individuals
> 125	> 50	Emerging evidence links potential adverse effects to such high levels, particularly > 150 nmol/L (> 60 ng/mL)

*Serum concentrations of 25(OH)D are reported in both nanomoles per liter (nmol/L) and nanograms per milliliter (ng/mL)

**1 nmol/L = 0.4 ng/mL