Specimen Requirements


Vitamin A (Retinol)

Specimen Requirement

Patient preparation:
Fast 12-14 hours

Collection instructions:
Collect SST or red top, centrifuge within 2 hours of collection, transfer 1.0 mL serum to an amber screw top plastic vial, indicate sample type on tube and send frozen on dry ice.

Critical frozen. Protect from light.


High Performance Liquid Chromatography


Room temp/Refrigerated: Unacceptable, Frozen: 60 days

Reference Range

The reference range is determined by the performing laboratory and will show on the report.


1-4 days performed Monday-Friday

Clinical Use

Differential diagnosis of hypervitaminosis A. A combination of a low serum carotene level and a low vitamin A suggests inadequate vitamin A nutrition.

Test Code