Blood tests. The diagnosis is based on symptoms and a low level of vitamin A in the blood. If people have problems seeing in the dark, eye tests, such as electroretinography (see Tests for Eye Disorders: Electroretinography), may be done to determine whether vitamin A deficiency is the cause.isorders that impair the intestineâs absorption of fats can reduce the absorption of vitamin A and increase the risk of vitamin A deficiency. These disorders include chronic diarrhea, celiac disease, cystic fibrosis, certain pancreatic disorders, and blockage of the bile ducts.
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