Test ID: Z4781
CPT code: 84590
LOINC: 2923-1
Specimen Type: Red or SST
Frequency: 3 – 5 days next day.
Instructions: 0.8 mL Serum from Red or SST, Ambient. Min 0.4 mL.
Text: Differential diagnosis of hypervitaminosis A. A combination of a low serum carotene level and a low vitamin A suggests inadequate vitamin A nutrition. Vitamin A deficiency only manifests when liver stores are depleted by prolonged reduction of dietary intake. The initial symptom of vitamin A deficiency is an inability to adapt vision to darkness.
Methodology: Liquid chromatography/tandem mass spectrometry (LC/MS-MS)