Criteria
Vitamin D status by serum 25-hydroxyvitamin D concentration
Definitions regarding optimal serum concentrations vary according to the source used.[1][2]
The author’s preferred criteria are as follows:[3]
Deficiency: serum 25-hydroxyvitamin D <50 nanomoles/L (≤20 nanograms/mL)
Insufficiency: serum 25-hydroxyvitamin D between 52 and 72 nanomoles/L (21 and 29 nanograms/mL)
Sufficiency: serum 25-hydroxyvitamin D between 75 and 250 nanomoles/L (30 and 100 nanograms/mL)
Intoxication: serum 25-hydroxyvitamin D >374 nanomoles/L (>150 nanograms/mL)
The Endocrine Society in 2024 no longer endorses specific 25-hydroxyvitamin D concentrations to define vitamin D sufficiency, insufficiency, and deficiency.[4]
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