As a rule, younger people need less vitamin D than older people, regardless of sex. This article explains average vitamin D ...

These two types of vitamin D work similarly in the body, and their sum in your test results is your total vitamin D level. The total vitamin D level is the most important number and what your ...

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 ...

The Vitamin D Blood Test (25-OH Vitamin D): Who, How, When, and Where Clinically speaking, things began to change in the 1970s when the blood test for vitamin D (known as the "25-OH vitamin D ...