Metabolic panel
Vitamin D
Also called 25-hydroxyvitamin D · measured in ng/mL
What it measures
The storage form of vitamin D, reflecting overall status.
Why it is tracked
Deficiency is common, contributes to fatigue and low mood, and is straightforward to correct. Worth measuring before attributing those symptoms to hormones.
What a provider considers
- Lower in winter and at higher latitudes
- Absorption is fat-dependent
- Correctable with supplementation, then re-tested
Reference ranges vary between laboratories and a single result rarely means much on its own. Interpretation depends on your symptoms, your other markers and the trend over time — which is what your provider reviews.