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

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 ...

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

Scientists are looking for volunteers to take part in a trial to see if taking vitamin D can give the immune system ... for six months if a finger-prick test shows they are deficient in the ...