Which tests measure 25-Hydroxyvitamin D?

25-Hydroxyvitamin D is measured in 2 tests on BiomarkersLabs.com, including ADHD Premium Panel, ADHD Ultimate Panel.

Biomarker Reference · 25(OH)D

What does the 25-Hydroxyvitamin D test measure?

Q: Why is 25-Hydroxyvitamin D measured?

Vitamin D deficiency is common and has been associated with mood disorders, cognitive impairment, and, in some studies, ADHD symptoms. Supplementation trials show inconsistent effects on attention or behaviour, suggesting that correction of deficiency is important for general neurodevelopment but not a specific ADHD treatment.

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

The standard reference range for 25-Hydroxyvitamin D is Sufficiency typically defined as ≥30 ng/mL (75 nmol/L); 20–29 ng/mL considered insufficient, <20 ng/mL deficient.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

25-Hydroxyvitamin D (25(OH)D) is a clinical biomarker used in neurological-mental-health assessment. 25-Hydroxyvitamin D is the major circulating form of vitamin D and the best marker of vitamin D status. It is measured in 2 laboratory tests on BiomarkersLabs.com.

Reference Range: Sufficiency typically defined as ≥30 ng/mL (75 nmol/L); 20–29 ng/mL considered insufficient, <20 ng/mL deficient.
Units: ng/mL, nmol/L
Measured In: 2 tests
Category: Neurological

Functional medicine optimalGeneral guidelines define sufficiency as ≥30 ng/mL; some integrative protocols target 40–60 ng/mL, though higher targets lack specific validation for ADHD.

What is 25-Hydroxyvitamin D?

25-Hydroxyvitamin D is the major circulating form of vitamin D and the best marker of vitamin D status. It is hydroxylated in the kidney to the active hormone calcitriol, which acts through the vitamin D receptor expressed widely in the brain, influencing dopamine synthesis, neuroprotection, and immune modulation.

Why is 25-Hydroxyvitamin D measured?

Vitamin D deficiency is common and has been associated with mood disorders, cognitive impairment, and, in some studies, ADHD symptoms. Supplementation trials show inconsistent effects on attention or behaviour, suggesting that correction of deficiency is important for general neurodevelopment but not a specific ADHD treatment.

Reference ranges

Standard reference: Sufficiency typically defined as ≥30 ng/mL (75 nmol/L); 20–29 ng/mL considered insufficient, <20 ng/mL deficient.
Functional medicine optimal: General guidelines define sufficiency as ≥30 ng/mL; some integrative protocols target 40–60 ng/mL, though higher targets lack specific validation for ADHD.
Units: ng/mL, nmol/L

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

Tests that measure 25-Hydroxyvitamin D

2 tests on BiomarkersLabs.com include this biomarker.

BML-CHP-020Comprehensive

ADHD Premium Panel

25-Hydroxyvitamin D reference range in this test: Approximately 30–100 ng/mL (75–250 nmol/L); method-specific.

BML-CHP-021Comprehensive

ADHD Ultimate Panel

25-Hydroxyvitamin D reference range in this test: Sufficiency typically defined as ≥30 ng/mL (75 nmol/L); 20–29 ng/mL considered insufficient, <20 ng/mL deficient.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

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