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Vitamin D Testing

The Mayo Medical Laboratories Difference


Updated: September 2013
Published: February 2009

Who Should Be Tested?

The following should be tested for vitamin D deficiency:

  • Individuals receiving therapy to prevent or treat osteoporosis
  • Elderly people, especially those with minimal exposure to sunlight
  • Patients with signs and symptoms of hypocalcemia or hypercalcemia
  • Children and adults with suspected rickets and osteomalacia, respectively
  • Patients receiving vitamin D therapy who do not demonstrate clinical improvement

Patient Impact

Vitamin D deficiency testing results in potential impacts:

  • Establishes the need for replacement therapy and guides appropriate treatment, avoiding undermedicating the patient
  • Overtreatment can also be detected, but it is rare—occurring only with long-term replacement at doses of almost 10,000 U/day or more

Benefits of Testing

Vitamin D deficiency testing provides:

  • Reliable assessment of vitamin D stores

Key