A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in your blood. It can indicate whether the ...

This unique vitamin is essential for all sorts of body functions, and especially for helping us maintain a strong skeleton.

10 mcg = 400 IU. 15 mcg = 600 IU. 20 mcg = 800 IU. It is much easier to access the patient’s need after a vitamin D blood test. Few individuals would allow their clinician to simply guess an ...