Lack of sun exposure, poor diet, malabsorption.

If deficient — for dose adjustment; if > 100 — possible toxicity.

Question 1

What is Vitamin D (25-OH)?

Accepted Answer

Vitamin D regulates calcium and phosphorus metabolism and affects immunity and bones. Deficiency is common, especially in northern latitudes.

Question 2

What are the normal Vitamin D (25-OH) levels?

Accepted Answer

Optimal: 30–60 ng/mL. Insufficient: 20–30. Deficient: < 20. (ng/mL)

Question 3

What causes low Vitamin D (25-OH)?

Accepted Answer

Lack of sun exposure, poor diet, malabsorption.

Question 4

What causes high Vitamin D (25-OH)?

Accepted Answer

Vitamin D supplement overdose.

Question 5

When should I see a doctor about Vitamin D (25-OH)?

Accepted Answer

If deficient — for dose adjustment; if > 100 — possible toxicity.

Vitamin D (25-OH)

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