Table 2.

Serum 25-hydroxyvitamin D concentrations and status

25(OH) vitamin D concentrationa	25(OH) vitamin D status
<10 ng/mL	Severe deficiency
10–<20 ng/mL	Deficient
20–<30 ng/mL	Insufficient
≥30 ng/mL	Adequate
≥100 ng/mL	Possible toxicity

^aMultiply by 2.5 to convert to nmol/L