Vitamin A
Label Mnemonic: | VTA |
Epic code: | LAB4249 |
Downtime form: | A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery |
Commercial Mailout Laboratory
6240-8 RCP
356-8593
6240-8 RCP
356-8593
Specimen(s):
Serum
Specimen
Instructions:
Patient should fast for 12 hours and abstain from alcohol for 24 hours
prior to collection.
Collection Medium:
Red top tube 5 mL (Clot Activator) |
Minimum:
Preferred Minimum: 1 mL serum
Absolute Minimum: 0.2 mL serum
Absolute Minimum: 0.2 mL serum
Rejection Criteria:
Whole blood or body fluids other than serum.
Delivery Instructions:
Deliver to laboratory immediately after collection.
Turn Around
Time:
1-4 days upon receipt at reference laboratory
Reference Range:
Vitamin A (Retinol) 0-1 month 0.18 - 0.50 mg/L 2 months-12 years 0.20 - 0.50 mg/L 13-17 years 0.26 - 0.70 mg/L 18+ years 0.30 - 1.2 mg/L Retinyl Palmitate 0-150 years 0 - 0.10 mg/L
Comments:
Serum retinol is typically maintained until hepatic stores are almost
depleted. Values greater than 0.30 mg/L represent adequate liver
stores, whereas values less than 0.10 mg/L indicate deficiency.
Samples
that come in contact with plastic tubing or have been exposed to
excessive light may show low results.
Vitamin A toxicity occurs when retinol concentration exceeds the capacity of retinol binding protein (RBP). Individuals with compromised renal function can retain RBP and may, therefore, have moderate retinol elevations. Drugs which interfere with vitamin A analysis include probucol (Lorelco).
This assay does not measure other vitamin A metabolites such as retinaldehyde and retinoic acid.
Vitamin A toxicity occurs when retinol concentration exceeds the capacity of retinol binding protein (RBP). Individuals with compromised renal function can retain RBP and may, therefore, have moderate retinol elevations. Drugs which interfere with vitamin A analysis include probucol (Lorelco).
This assay does not measure other vitamin A metabolites such as retinaldehyde and retinoic acid.
Test
Limitations:
Samples which come in contact with plastic tubing or have been exposed
to excessive light may show low results.
Methodology:
Quantitative High Performance Liquid Chromatography
CPT Code:
84590