What Is It?

25HDN, or 25-Hydroxyvitamin D2 and D3, S is a diagnostic test to screen for vitamin D deficiency. It is also useful as a diagnostic tool to determine the causes of rickets and osteomalacia (softening of the bones), to monitor Vitamin D levels during replacement therapy, and to diagnose hypervitaminosis D, also called vitamin D toxicity. 25HDN is a simple blood test.

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Who Is It For?

Vitamin D testing is recommended for:

  • Anyone concerned about their well-being, health, and vitamin D levels
  • Those who suffer from Seasonal Affective Disorder
  • Anyone who receives treatment or therapy for osteoporosis and other bone disorders
  • Elderly people, particularly those with insufficient exposure to sunlight 
  • People with a diagnosis or signs of hypocalcemia or hypercalcemia (too much or too little calcium)
  • Anyone suffering from rickets and osteomalacia 
  • Patients receiving vitamin D therapy who don’t show signs of improvement
  • Children who frequently get sick

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Why Is It Important?

Vitamin D is a nutrient our bodies need to stay healthy. It keeps our bones strong, aids in calcium absorption, and regulates the function of the parathyroid gland.
Insufficient vitamin D levels can cause:

  • Loss of bone density
  • Increased susceptibility to viral infections
  • Rickets, osteomalacia, osteoporosis and other bone diseases

There is also evidence that may indicate that vitamin D deficiency can contribute to diabetes, high blood pressure, cancer, and autoimmune conditions such as multiple sclerosis.

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