What is Vitamin D (25-OH)?
your vitamin D stores
Vitamin D measures your overall vitamin D stores. It is central to bone health, immunity, and mood. Deficiency is common in Sweden during the winter months.
The body makes vitamin D in the skin from sunlight and gets a smaller amount from food. Darker skin, indoor lifestyle, older age, and overweight all raise the risk of deficiency.
Test facts
- Unit
- nmol/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 3 days
What does low Vitamin D (25-OH) mean?
Low vitamin D is common in Sweden. Symptoms can include fatigue, muscle aches, and impaired immunity. Deficiency is treated with supplementation.
What does high Vitamin D (25-OH) mean?
Very high vitamin D is uncommon and almost always reflects excess supplementation.
Panels that measure Vitamin D (25-OH)
- Essentials
- Deep Baseline
- Female Annual
- Male Annual
- Hormone+
- Perimenopause
- Pre-Conception
- Thyroid Complete
- Core Vitamins
- Vitamin D Check
- Vitamins & Minerals Full
- Longevity Core
- Longevity Full
- Athlete Performance
More markers in the same area
Launching in Stockholm in 2026.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.