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Vitamin D is measured, not calculated, from a 25(OH)D blood test. The Endocrine Society defines under 10 ng/mL as severely deficient, 10–29 ng/mL as deficient, and 30 ng/mL or above as sufficient. Many labs print a wider "normal" range on the report, but a result inside that range can still sit in the deficient zone by this guideline.
These are the Endocrine Society Vitamin D Clinical Practice Guideline thresholds. There is no coded upper "toxicity" cutoff here deliberately — your lab's own high flag or your clinician should confirm toxicity risk at unusually high levels.
| Category | 25(OH)D (ng/mL) | 25(OH)D (nmol/L) |
|---|---|---|
| Severely deficient | Below 10 | Below 25 |
| Deficient | 10–29.9 | 25–74.9 |
| Sufficient | 30 or above | 75 or above |
A direct walk-through of the conversion and what the guideline says at this level.
ng/mL = nmol/L ÷ 2.496
9.6 ng/mL falls under the Endocrine Society's severely deficient threshold of 10 ng/mL. At this level, prescription-dose repletion is usually the appropriate next step rather than a standard over-the-counter dose — this is a see-your-doctor-within-a-week situation, not one to self-treat.
Once repletion is underway and levels start rising, an ongoing maintenance dose is commonly in the range of 2,000–4,000 IU of vitamin D3 daily, taken with a fat-containing meal to help absorption. Levels typically rise meaningfully within 8–12 weeks of consistent dosing, which is when a retest makes sense; mood, energy, and sleep quality can start to improve within 4–8 weeks.
References & Guidelines
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