Vitamin D
A fat-soluble vitamin important for bone health, immune function, and mood — commonly low in many people.
This is educational information, not a diagnosis. Only a doctor reviewing your full report and history can properly interpret your result.
What It Is
Blood tests typically measure 25-hydroxyvitamin D, the storage form of vitamin D, which reflects both sun exposure and dietary or supplement intake over the preceding weeks.
Why It Matters
Vitamin D supports calcium absorption and bone health, and has been studied for its role in immune function and mood — low levels are common, particularly with limited sun exposure or darker skin tones.
Typical Reference Range
Reference ranges are often described in bands roughly below 20 ng/mL as deficient, 20-30 ng/mL as insufficient, and above roughly 30 ng/mL as sufficient, though target levels are debated and vary by lab and guideline.
What Can Affect Your Results
- Sun exposure and geographic location
- Skin tone and sunscreen use
- Diet and supplement use
- Body weight, since it's stored in fat tissue
- Certain digestive conditions affecting absorption
When It's Typically Checked
Vitamin D is commonly checked during general wellness screening, especially when fatigue, bone health, or immune concerns are being evaluated.
Related Tests
Medical Disclaimer
This page is provided for general educational purposes only and does not diagnose, treat, or interpret your individual results. Reference ranges vary between laboratories and testing methods, and a result outside a ‘typical’ range does not necessarily indicate a health problem, just as a result inside it doesn’t rule one out. Only a qualified physician reviewing your complete health picture can properly interpret your lab results — please discuss your reports with Dr Naturals or your treating doctor rather than relying on this page alone.