Vitamin D (25-Hydroxy vitamin D; inactive form from sun and dietary sources) must convert into vitamin D (1,25-Dihydroxy vitamin D; active form). This test is recommended along with the 25-hydroxy vitamin D to see if the correct amount of the active form is being producted. This level plays a role in cardiovascular, immune (autoimmunity), and brain health.

Tests included:

• 1,25-Dihydroxy vitamin D (inactive form of vitamin D)

Fasting Required: No

Specimen: Blood