Vitamin A (Retinol), Serum : 921

Test Code
VITA or 921

Alias/See Also
Retinol

CPT Codes
84590

Instructions
Overnight fasting is preferred.

Serum separator tube. Protect from light.

Transport Container
Protect from light during collection, storage, and shipment. Centrifuge serum separator tube as soon as possible after clotting and transfer serum to an amber transport tube (preferred) or protect the separator tube from light with foil or place in an amber bag. 2 mL serum (Min: 0.7 mL).

Transport Temperature
Refrigerated.

Specimen Stability
After separation from cells: Ambient: 24 hours; Refrigerated: 7 days; Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Not protected from light.

Methodology
High Performance Liquid Chromatography (HPLC)

Setup Schedule
Monday - Saturday

Report Available
3 days (From receipt at performing laboratory)

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



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.