25-OH Vitamin D2 details
What 25-OH Vitamin D2 shows
25-hydroxyvitamin D2 is the circulating form of vitamin D your body produces specifically from ergocalciferol (D2), the plant- and fungus-derived form of vitamin D found in some fortified foods and prescription supplements. Because D2 isn't made by your skin from sunlight the way D3 is, a measurable D2 level usually reflects recent supplementation or dietary intake rather than sun exposure. It's typically reported alongside 25-OH Vitamin D3 as part of a 'fractionated' vitamin D test, which separates out how much of your total vitamin D is coming from each source. This split can be useful for confirming a D2 prescription or supplement is actually being absorbed, or for understanding the full picture behind an unusual total vitamin D result.
Tests that include 25-OH Vitamin D2
This panel measures total 25-OH vitamin D, 25-OH vitamin D2, and 25-OH vitamin D3 to assess nutritional deficiencies and monitor nutrient supplementation.
- Vitamin D, 25-OH, Total The combined measure of both major forms of vitamin D (D2 and D3) in your blood — the standard test used to assess overall vitamin D status.
- 25-OH Vitamin D2 The form of vitamin D your body makes from plant-based (D2) supplements or fortified foods. Reflects how much vitamin D you're getting from these sources.
- 25-OH Vitamin D3 The main form of vitamin D your body produces from sun exposure or gets from animal-based foods and supplements. Shows the D3 part only; overall vitamin D status is judged on total 25-OH vitamin D.
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