Testsealabs Vitamin D Test
Vitamin D: Key Information and Health Significance
Vitamin D refers to a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, iron, magnesium, phosphate, and zinc. In humans, the most important compounds in this group are vitamin D3 and vitamin D2:
- Vitamin D3 is naturally produced in the human skin through exposure to ultraviolet light.
- Vitamin D2 is mainly obtained from foods.
Vitamin D is transported to the liver, where it is metabolized to 25-hydroxy vitamin D. In medicine, a 25-hydroxy vitamin D blood test is used to determine vitamin D concentration in the body. The blood concentration of 25-hydroxy vitamin D (including D2 and D3) is considered the best indicator of vitamin D status.
Vitamin D deficiency is now recognized as a global epidemic. Virtually every cell in our body has receptors for vitamin D, meaning that they all require a “sufficient” level of vitamin D for adequate functioning. The health risks associated with vitamin D deficiency are far more severe than previously thought.
Vitamin D deficiency has been linked to various serious diseases, including:
- Osteoporosis and osteomalacia
- Multiple sclerosis
- Cardiovascular diseases
- Pregnancy complications
- Diabetes
- Depression
- Strokes
- Autoimmune diseases
- Flu and other infectious diseases
- Different cancers
- Alzheimer’s disease
- Obesity
- Higher mortality
Therefore, detecting (25-OH) vitamin D levels is now considered a “Medically Necessary Screening Test,” and maintaining sufficient levels is crucial not just to improve bone health, but to enhance overall health and well-being.



