How is vitamin D status determined?

Updated: Dec 15, 2020
  • Author: Vin Tangpricha, MD, PhD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Measurement of serum 25-hydroxyvitamin D (25[OH]D) is the best test to determine vitamin D status. Levels of 25(OH)D are interpreted as follows [1] :

  • 21-29 ng/mL (52.5-72.5 nmol/L): Vitamin D insufficiency

  • < 20 ng/mL (< 50 nmol/L): Vitamin D deficiency

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