Nutrition
25-Hydroxyvitamin D Level
25-hydroxyvitamin D level is the standard blood test for vitamin D status—used to choose maintenance, loading, or sun and food strategies.
25-hydroxyvitamin D level is the blood test measuring stored vitamin D status—the standard lab before dosing changes. Many guidelines target roughly 30–50 ng/mL (75–125 nmol/L) for bone and general health, with individual targets set by your clinician.
Levels below 20 ng/mL often warrant repletion; very high levels raise toxicity concern. Season, latitude, skin pigmentation, sunscreen, and supplement adherence shift results.
Common questions
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Is higher 25-OH-D always better?
No—levels far above sufficiency do not linearly improve bones and may harm. Aim for clinician-agreed targets, not maximum possible numbers.
Related terms
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