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The page below is a sample from the LabCE course Vitamin D Regulation, Clinical Significance and Treatment (by ASCLS). Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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1. Vitamin D deficiency is diagnosed by measuring a total serum 25(OH)D of <10 ng/ml.

2. The clinical significance and laboratory cut-off of 25(OH)D for vitamin D insufficiency is controversial.

3. Vitamin D supplementation can be accomplished with food, sunlight, and over-the-counter or prescription vitamin D preparations.

4. The maintenance dose of oral vitamin D is controversial, although 1000-2000 IU D3per day appears to be safe. There is risk to taking too much vitamin D supplementation.