OneDayTests Vitamin D (25-OH) Blood Test
Type
Blood Testing
Biomarkers
1
Duration
30 min
Results
3 days
Comprehensive blood test to measure Vitamin D levels and assess health risks.
Vitamin D is a fat-soluble vitamin essential for maintaining bone health, regulating calcium and phosphorus levels in the body, and supporting immune function. Adequate vitamin D levels are associated with a lower risk of heart disease and may help regulate blood pressure and reduce inflammation. Vitamin D is important for muscle strength and function; deficiency can lead to muscle weakness and pain. Low vitamin D levels have been linked to autoimmune diseases.
Key Details
Who Is This For?
Anyone living in regions with limited sunlight or who spends most time indoors. People experiencing bone pain, muscle weakness, or frequent illness. Those with darker skin (melanin reduces vitamin D synthesis). Older adults, as the skin's ability to produce vitamin D decreases with age. Anyone supplementing with vitamin D who wants to verify they're in the optimal range.
What's Included
Preparation Required
No fasting required. No special preparation needed. If you supplement with vitamin D, continue your normal dosage — the test is measuring your steady-state level, not an acute response.
Biomarkers Tested
1The best indicator of overall vitamin D status. Vitamin D is essential for calcium absorption, bone health, immune function, and mood regulation. Deficiency is extremely common, especially in northern latitudes, and linked to increased disease risk.
Available at 29 locations
View on mapMore from OneDayTests
Ultimate Longevity Blood Test
$290Comprehensive blood test analyzing 66 biomarkers for a detailed health assessment.
Cholesterol Blood Test
$37Comprehensive blood test to analyze cholesterol levels and assess cardiovascular risks.
Liver Function Blood Test
$35Comprehensive liver function blood test measuring liver enzymes, proteins, and bilirubin to assess liver health.
Ultimate Performance Blood Test
$190Comprehensive blood test analyzing 57 biomarkers for detailed health insights and performance optimization.
Subscription plans available with discounts up to 20% off
- Category
- Diagnostic
- Sample Type
- Blood draw
- Duration
- 30 min
- Results
- 3 days
OneDayTests
Quick access to same-day medical testing with fast results for better health decisions.
