The S. Vitamin D3 test measures the amount of vitamin D in your blood, specifically 25-hydroxyvitamin D [25(OH)D], which is the best indicator of vitamin D status.
Vitamin D is essential for:
Bone health – helps absorb calcium & phosphorus.
Immune system function.
Muscle strength and nerve signaling.
Doctors recommend it to:
Detect vitamin D deficiency or excess.
Investigate bone pain, muscle weakness, or fractures.
Monitor people with osteoporosis.
Check patients with malabsorption disorders (e.g., celiac, Crohn’s).
Monitor people on long-term vitamin D supplementation.
(Values may slightly vary by lab)
| Vitamin D Status | 25(OH)D Level |
|---|---|
| Deficiency | <20 ng/mL |
| Insufficiency | 20–30 ng/mL |
| Sufficiency (Optimal) | 30–100 ng/mL |
| Possible Toxicity | >100 ng/mL |
Weakness, tiredness.
Bone pain, joint pain.
Muscle cramps.
Frequent infections.
In severe cases – rickets (in children) or osteomalacia (in adults).
No special fasting required.
Inform your doctor if you are on vitamin D supplements (can affect results).
Same Day*
1
