Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

Learn about the best time of day and way to take vitamin D and if you should consider a supplementing with this nutrient.

Peeing more than usual and feeling more thirsty are symptoms of too much vitamin D. Learn why overdosing on vitamin D is ...

and prices vary from $10 to $50, so local laboratory costs should be checked before telling the patient that a vitamin D test is needed. An example of the greater need for utilizing the vitamin D ...