Micronutrient, Vitamin A (Retinol)
Use
The Vitamin A (retinol) test quantifies retinol circulating in blood, the primary active form of vitamin A. It aids in assessing whether levels are low (deficiency) or high (possible toxicity), informing dietary or supplement decisions. Retinol supports vision (especially in low light), immune function, skin and mucous membrane integrity, and metabolic health; imbalances may lead to vision issues, immune vulnerability, skin changes, liver concerns, and other symptoms.
Special Instructions
Fasting prior to sample collection (8–12 hours) is generally recommended; supplements or certain medications may interfere with results, so providers or patients should clarify whether to pause these before testing.
Limitations
Specific limitations such as interference, analytic sensitivity, or population-specific reference ranges were not provided in the available sources; any such constraints should be referred to Quest Diagnostics’ official material when available.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Result Turnaround Time
3-5 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
Not provided
Minimum Volume
Not provided
Collection Instructions
Fasting for 8–12 hours prior to collection; avoid supplements or interfering medications.
Other tests from different labs that may be relevant