Levels should be interpreted using 25-hydroxyvitamin D, which is the major circulating form and reflects total vitamin D stores. 1,25-dihydroxyvitamin D is not useful for screening.
Verified
Last Review: 2026
| Category | ng/mL | nmol/L |
|---|---|---|
| Deficiency | < 20 | < 50 |
| Insufficiency | 20 – 29 | 50 – 74 |
| Sufficiency (Optimal) | 30 – 100 | 75 – 250 |
| Toxicity | > 100 | > 250 |
Holick MF et al. • J Clin Endocrinol Metab. 2011;The consensus guideline for vitamin D thresholds and replacement strategies.
Last Comprehensive Review: 2026
Clinical Context
We think this has broad domain relevance to Vitamin D Status Interpretation.
Clinical Context
We think this might be relevant to the clinical guidance for Vitamin D Status Interpretation.
Clinical Context
We think this might be relevant to the clinical guidance for Vitamin D Status Interpretation.
