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Vitamin D, 25-Hydroxy

Abbreviation: 25-OH Vitamin D

Panel: Vitamin & Mineral Tests · All vitamins & minerals tests

Typical adult reference range

Conventional units30–50 ng/mL
SI units75–125 nmol/L

Ranges vary between laboratories and methods — compare your result with the range printed on your own report.

What a high or low result can mean

High vitamin d, 25-hydroxy: high values can be seen with excess vitamin D supplementation.

Low vitamin d, 25-hydroxy: low values may occur with limited sun exposure, poor intake, or malabsorption.

These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.

Good to know

The range shown is a commonly used sufficiency range; category cut-offs for deficiency and insufficiency vary between guidelines.

◆ Kidney note

This test is closely tied to kidney health, and it is one a kidney specialist (nephrologist) watches closely. On this site, kidney-related results are a special focus: see the kidney and dialysis medicines in our Drug Guide and the kidney condition hubs for the wider picture.

Related tests — Vitamin & Mineral Tests

CopperFolate, Red Blood CellFolate, SerumMethylmalonic AcidSeleniumThiamine (Vitamin B1)Vitamin A (Retinol)Vitamin B12 (Cobalamin)
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.