Which tests measure 25-Hydroxyvitamin D2?

25-Hydroxyvitamin D2 is measured in 1 test on BiomarkersLabs.com, including 25-Hydroxyvitamin D (D2, D3).

Biomarker Reference · 25(OH)D2

What does the 25-Hydroxyvitamin D2 test measure?

Q: What is the reference range for 25-Hydroxyvitamin D2?

The standard reference range for 25-Hydroxyvitamin D2 is Varies by assay; typically minimal unless ergocalciferol supplementation or fortified-food intake is present.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

25-Hydroxyvitamin D2 (25(OH)D2) is a clinical biomarker used in vitamins-minerals assessment. D2 arises from dietary ergocalciferol (plant-derived vitamin D) and some fortification sources. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Varies by assay; typically minimal unless ergocalciferol supplementation or fortified-food intake is present.
Units: nmol/L, ng/mL
Measured In: 1 test
Category: Vitamins & Minerals

Functional medicine optimalNot independently defined; interpreted as part of total 25(OH)D.

What is 25-Hydroxyvitamin D2?

D2 arises from dietary ergocalciferol (plant-derived vitamin D) and some fortification sources. Its 25-hydroxylated form is measured separately by LC-MS/MS assays. D2 has lower binding affinity for vitamin D-binding protein and a shorter half-life than D3, so its contribution to total 25(OH)D is usually minor unless D2 is being supplemented.

Why is 25-Hydroxyvitamin D2 measured?

Reporting D2 separately allows the clinician to confirm D2 supplementation or identify very low D2 in patients taking only D3, which can help track adherence and source of vitamin D. It has no independent clinical threshold but contributes to total 25(OH)D.

Reference ranges

Standard reference: Varies by assay; typically minimal unless ergocalciferol supplementation or fortified-food intake is present.
Functional medicine optimal: Not independently defined; interpreted as part of total 25(OH)D.
Units: nmol/L, ng/mL

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure 25-Hydroxyvitamin D2

1 test on BiomarkersLabs.com include this biomarker.

BML-VIT-024Comprehensive

25-Hydroxyvitamin D (D2, D3)

25-Hydroxyvitamin D2 reference range in this test: Varies by assay; typically minimal unless ergocalciferol supplementation or fortified-food intake is present.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

25-Hydroxyvitamin D, Total25(OH)D1 test 25-Hydroxyvitamin D325(OH)D31 test

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