Table 1.
Vitamin D [25 (OH)D] range guidelines from various organizations, equivalences and terminology.
| Serum Levels [25 (OH) D] ng/mL | |||
|---|---|---|---|
| Vitamin D | Endocrine | Food and nutrition | |
| council* | society** | board*** | |
| Sufficient | 40–80 ng/mL | 30–100 ng/mL | >20ng/mL |
| Insufficient | 31–39 ng/mL | 21–29 ng/mL | 12–20 ng/mL |
| Deficient | 0–30 ng/mL | 0–20 ng/mL | 0–11 ng/mL |
| Vitamin D equivalences | |||
| 1 μg = 2.5 nmol | |||
| 1 μg = 40 IU | |||
| 1 ng/mL = 2.5 nmol/L | |||
| Terminology | |||
| 25-hydroxyvitamin D = [25(OH)D] = calcidiol | |||
| 1,25-dihydroxyvitamin D = [1,25(OH)2D] = calcitriol | |||
| Vitamin D = calciferol | |||
| Vitamin D2 = ergocalciferol | |||
| Vitamin D3 = cholecalciferol | |||
*Vitamin D Council: www.icwb.com/daily-vitamin-d-dosage-and-requirement. **Endocrine Society: Holick et al. (17) “Evaluation, Treatment and Prevention of Vitamin D Deficiency” www.endocrine.org/clinical-practice-guidelines/vitamin-d-deficiency. ***Food and Nutrition Board: www.ods.od.nih/gov/factsheets/VitaminD-HealthProfessional/. (same values as the Institute of Medicine -IOM).