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 CodeVITA
Quest Code
921
CPT Codes
84590
Preferred Specimen
2 mL serum
Patient Preparation
Overnight fasting is required.
Minimum Volume
0.7 mL
Instructions
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.
Send serum in an amber tube. If amber tube is not available, wrap tube in aluminum foil to protect from light.
Transport Container
Amber tube, or foil wrapped plastic screw-cap vial (protected from light)
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received in serum separator tube or red-top tube (no gel) collection tube • Received room temperature • Not light protected • Plasma • Grossly hemolyzed or heavily lipemic sera
Methodology
Chromatography
FDA Status
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.
Setup Schedule
Set up: Mon-Sat; Report available: 3-4 days
Limitations
Results may be elevated in women on oral contraceptives.
Reference Range
1-6 Years | 20-43 mcg/dL |
7-12 Years | 26-49 mcg/dL |
13-19 Years | 26-72 mcg/dL |
Adult | 38-98 mcg/dL |
Clinical Significance
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.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153
Last Updated: August 11, 2014