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

Don’t let all those “ph-ph” words confuse you. Once your blood is collected ... Some medicines, vitamins, and supplements can impact your test results' precision. These can include diuretics ...

Sometimes it may feel like almost every visit to the doctor includes a dreaded blood draw ... A comprehensive panel includes all of the above plus six different tests of liver function.

Almost all successful anti-fracture clinical trials have used vitamin D3 at a dosage of at least 800 IU/day (20 mcg per day). Ideally, the vitamin D blood test should be offered from the fall ...