Vitamin A Test Vitamin A is a fat-soluble vitamin that plays an important role in maintaining healthy vision, immune function, and skin health. It can be obtained from a variety of dietary sources, including fruits, vegetables, and animal-derived products. Pre-test preparation: No specific preparation is typically required for a vitamin A test. However, it is important to inform the healthcare provider if you are taking any supplements or medications, as these can affect the results of the test. Testing method: A blood sample is taken from a vein in the arm and sent to a laboratory for analysis. Common symptoms for prescribing this test: Dry, itchy skin Night blindness Dry eyes Impaired immunity Diagnosis of a vitamin A deficiency or toxicity Reference range: The reference range for vitamin A in the blood varies depending on the laboratory, but generally ranges between 20-80 mcg/dL. Normal values: Normal values of vitamin A in blood is about 20-80 mcg/dL Medical disclaimer: This information is for educational purposes only and is not intended to replace the advice of a healthcare professional. It is important to consult with a healthcare provider for specific information and guidance regarding your individual medical condition.