ARUP's Laboratory Test Directory
| 0080525: Vitamin A (Retinol), Serum or Plasma |
| Test Mnemonic: VIT A | |
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Methodology: High Performance Liquid Chromatography
Performed: Sun, Tue-Sat Reported: 1-4 days |
| Specimen Required: | |
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Collect: One 4 mL green (sodium or lithium heparin) or SST.
Transport: 1 mL plasma or serum, 2-8°C. (Min: 0.3 mL) Submit specimen in an ARUP Amber Transport Tube. Protect from light during collection, storage, and shipment. Pediatric Collection/Transport: 0.2 mL plasma or serum, 2-8°C. Protect from light during collection, storage, and shipment. Remarks: Draw specimen following an overnight (12-hour) fast. Patient should not consume alcohol for one day prior to blood draw. Avoid hemolysis. Transfer serum or plasma into an ARUP Amber Transport Tube ASAP. Protect from light during collection, storage, and shipment. Stability: After separation from cells: Ambient: Unacceptable; Refrigerated: 1 month; Frozen: 1 year |
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| Reference Interval: | |||||||||||||
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| Note: | |
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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. |
| CPT Code(s): | |
| 84590 |