Complete guide to Vitamin D testing, deficiency symptoms, normal ranges, and treatment options.
The Vitamin D test measures the level of 25-hydroxy vitamin D (25(OH)D) in your blood, which is the most accurate indicator of vitamin D status in the body. Vitamin D is essential for calcium absorption, bone health, immune function, and many other bodily processes.
This test helps diagnose vitamin D deficiency, insufficiency, and toxicity. It's also known as 25-hydroxy vitamin D test or calcidiol test.
Vitamin D deficiency affects over 1 billion people worldwide. It contributes to:
| Vitamin D Level | Status | Health Implications | Recommended Action |
|---|---|---|---|
| Below 20 ng/mL | Deficient | Rickets, osteomalacia, weakened immunity | High-dose supplementation + sunlight |
| 20-29 ng/mL | Insufficient | Increased disease risk, bone loss | Supplementation + lifestyle changes |
| 30-100 ng/mL | Sufficient | Optimal health and function | Maintain current levels |
| Above 100 ng/mL | Potentially Toxic | Hypercalcemia, kidney damage | Reduce supplementation, medical supervision |
Source: Endocrine Society guidelines. Note: Some labs use nmol/L (multiply ng/mL by 2.5)
Muscle weakness, bone pain, difficulty walking
Chronic tiredness, low energy levels
Delayed tooth eruption, dental cavities
Weakened immune system, frequent colds
Depression, seasonal affective disorder
Difficulty climbing stairs, muscle cramps
Detect and treat vitamin D deficiency early. Home sample collection available for your convenience.
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