A simple blood test that checks your vitamin D stores to support bones, muscles, and overall wellbeing.
Vitamin D (measured as 25-hydroxyvitamin D) is the storage form of vitamin D and the best marker of your overall vitamin D status. Your skin makes it from sunlight, and you also get it from food and supplements.
It helps your gut absorb calcium and phosphate, which keeps bones and muscles strong, and it plays a role in immune function.
Low vitamin D is very common in Germany and central Europe, especially in winter. It can weaken bones, contribute to muscle aches, and over time raises the risk of osteoporosis and fractures.
Very high levels are almost always caused by taking too much supplement and can push calcium too high. Testing tells you where you sit and whether supplementing makes sense.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
| Status | 25-OH vitamin D (SI) |
| Deficient | below 50 nmol/L |
| Insufficient | 50 to 75 nmol/L |
| Sufficient | 75 to 125 nmol/L |
Ranges are guidance only and thresholds differ between expert bodies. 50 nmol/L (20 ng/mL) is a widely used deficiency cut off. Read your result against your own lab's interval. To convert, 1 ng/mL equals 2.5 nmol/L.
Levels swing with season and sun exposure and are usually lowest in late winter. Recent high dose supplements raise the number. Some assays measure D2 and D3 differently, which can shift results between labs. No fasting needed.
Read alongside calcium, phosphate, and parathyroid hormone (PTH) when bone health or calcium balance is the question.
What does my vitamin D result mean? It reflects your body’s vitamin D stores. Low levels suggest you may need more intake, sun, or a supplement plan.
Do I need to fast for this test? No. You can eat and drink normally unless your clinician gives other instructions.
What can affect my result? Recent supplements, sun exposure, season, skin tone, age, pregnancy, and some medicines can change levels. High-dose biotin may skew some tests.
How often should I test? If starting or changing supplements, or at higher risk, consider retesting after a few months or as advised by your clinician.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Your symptoms, diet, sun habits, and medications, plus whether to adjust supplements and recheck calcium or PTH.
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