Vitamin A

Casandra

Casandra Test Code LC17778Version 1 (DRAFT)

Performing Lab

Lab LabcorpLab Test ID 017509CPT Code 84590

Also known as: A, Vitamin, Retinol, Serum

Clinical Use

Order Test

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.

Test Details

Methodology

Mass Spectrometry

Biomarkers

Retinol

Analyte

Vitamin A • Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

LOINC Codes

Order Codes

2923-1

Result Codes

2923-1

Result Turnaround Time

4-5 days

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.