Vitamin A
Also known as: A, Vitamin, Retinol, Serum
Use
Differential diagnosis of hypervitaminosis A. A combination of a low serum carotene level and a low vitamin A suggests inadequate vitamin A nutrition.
Special Instructions
Patients should abstain from alcohol for 24 hours prior to collection. For those younger than six months, draw the sample prior to the next feeding. Blood should be collected before breakfast in the morning and prior to any medication.
Limitations
This test was developed by LabCorp and its performance characteristics determined, but it has not been cleared or approved by the FDA. Serum retinol levels, while useful, do not always accurately reflect liver retinyl ester levels. The presence of confounding factors such as recent supplementation or liver consumption should be considered when interpreting results.
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 2923-1
- 2923-1
Result Turnaround Time
4-5 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
0.8 mL
Minimum Volume
0.4 mL
Container
Red-top tube or gel-barrier tube
Collection Instructions
If a red top is used, transfer separated serum to a plastic transport tube.
Patient Preparation
Patient should abstain from alcohol for 24 hours prior to collection. For those who are younger than six months, draw prior to next feeding. Blood should be collected before breakfast in the morning and prior to any medication.
Storage Instructions
Room temperature
Causes for Rejection
Sample type other than serum received
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 14 days |
| Frozen | 14 days |