Vitamins
Vitamin D (25-OH) reference ranges and a short guide to interpreting your result.
Educational guide only — not medical advice. Always review results with a qualified clinician.
25-OH vitamin D (calcidiol) in blood is the most common measure. Reference ranges vary by lab; many labs define "insufficient" or "deficient" with a lower cutoff. Interpret your result using the range on your report. Low vitamin D may relate to bone health and immunity; supplementation and dose should be decided by a doctor.
This content is for information only. Discuss your results with a doctor. Understand lab results · Analyze
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This article is educational and should be reviewed alongside our medical review, methodology, and transparency pages. Use it to prepare for a clinician conversation, not as a diagnosis.
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