This vitamin blood test may be used to determine Vitamin A deficiency or toxicity. Vitamin A deficiency may be caused by malnutrition or those with malabsorption disorders such as celiac disease, Crohn's disease or cystic fibrosis. Vitamin A toxicity may be caused by overuse of supplements or a diet with a high amount of foods rich in Vitamin A, such as liver. Turnaround time for the vitamin A blood test is typically 2-3 business days.
The Vitamin A test requires fasting for 8 hours prior to going in for blood collection. Foods containing Vitamin A should be avoided 48 hours prior to this deficiency / toxicity testing.