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Vitamin A (Retinol)Test Code
2 mL serum
Separate from cells as soon as possible after clotting. Send serum in an amber tube. If amber tube is not available, wrap tube in aluminum foil to protect from light.
Plastic screw-cap vial, protected from light
Refrigerated (cold packs)
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Not protected from light (room temperature and refrigerated) • Plasma
High Performance Liquid Chromatography (HPLC)
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Results may be elevated in women on oral contraceptives.
|1-6 Years||20-43 mcg/dL|
|7-12 Years||26-49 mcg/dL|
|13-19 Years||26-72 mcg/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 are rarely due to inadequate diet.
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153