Vitamin D
The Vitamin D Test measures levels of 25-hydroxyvitamin D (25(OH)D) in the blood, which is the best indicator of vitamin D status in the body. Vitamin D plays a crucial role in calcium absorption, bone strength, immune function, and muscle health. Deficiencies can lead to fatigue, weakened bones, a higher risk of fractures, and a weakened immune system.
Test details
Sample type
Blood
Time of day
No specific time required
Fasting required
No
Results timeframe
Within 7 days
Preparation
No special preparation required
What's measured in this test
Vitamin D
Measures vitamin D for bone and immune health.
Common reasons for testing
- Bone Health Concerns – Helps assess the risk of osteoporosis, fractures, or bone weakness.
- Fatigue or Muscle Weakness – Identifies vitamin D deficiency as a potential cause of low energy and muscle pain.
- Limited Sun Exposure – Evaluates vitamin D levels in individuals who spend most of their time indoors or live in areas with low sunlight.
- Immune Function Monitoring – Assesses vitamin D’s role in supporting a healthy immune response.
- Malabsorption Conditions – Checks for deficiencies in people with conditions like Crohn’s disease, celiac disease, or gastric bypass surgery.
- Routine Health Screening – Monitors vitamin D levels to maintain overall well-being.