Vitamin A Blood Test

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Latest Edit: Hector 2014-03-21 (EDT)

See Also Lab Tests

The vitamin A or retinol test is generally used to detect vitamin A deficiency or toxicity. [1], [2]


  • This test measures the amount of retinol in the blood.
  • Retinol is the primary form of vitamin A in animals.
  • Vitamin A is an essential nutrient that is required for healthy vision, skin growth and integrity, bone formation, immune function, and embryonic development.
  • It is required to produce photoreceptors in the eyes and to maintain the lining of the surface of the eyes and other mucous membranes.
  • Deficiencies in vitamin A can lead to impaired night vision, cause eye damage, and in severe cases lead to blindness.

Patient Preparation

  • Fasting is required.

Clinical Implications

High levels indicate:

Low levels indicate:

Associated Tests


  1. Pagana Kathleen D, Pagana Timothy J (2006) Mosby's Manual of Diagnostic and Laboratory Tests, Mosby.
  2. Weatherby Dicken, Ferguson Scott (2002) Blood Chemistry and CBC Analysis: Clinical Laboratory Testing from a Functional Perspective, Bear Mountain.