|Test List||A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #|
Vitamin A (Retinol)Test Code
2 mL serum
Centrifuge serum specimen within 1 hour of collection. Transfer serum to plastic, amber vial. If amber vial is not available, wrap tube in aluminum foil to protect from light. Refrigerate and send refrigerated (cold packs) or freeze -80°C and ship frozen on dry ice.
Plastic screw-cap vial protected from light
Refrigerated (cold packs)
Room Temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 Year
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received unfrozen and unprotected from light • Frozen unprotected from light • Plasma
High Performance Liquid Chromatography (HPLC)
Results may be elevated in women on oral contraceptives.
|1-6 Years||20-43 µg/dL|
|7-12 Years||26-49 µg/dL|
|13-19 Years||26-72 µg/dL|
Vitamin A is critical for vision, growth, and many cell functions. High concentrations of vitamin A are seen with renal failure, but this is not associated with toxicity, and excessive ingestion. High concentrations are associated with bone fractures. Low concentrations of vitamin A are consistent with fat malabsorption and rarely due to inadequate diet. Vitamin A, vitamin E, and carotene are always extracted and detected simultaneously. This is a free vitamin A (retinol).
Quest Diagnostics Nichols Institute