Do not use for evaluation of thiamine sufficiency. Refer to Vitamin B1 (Thiamine), Whole Blood (0080388) for nutritional assessment of thiamine.
Quantitative High Performance Liquid Chromatography
Green (sodium or lithium heparin), lavender (EDTA), plasma separator tube, or pink (K2 EDTA).
Separate plasma from cells within one hour of collection. Transfer 1 mL plasma to an ARUP Standard Transport Tube. (Min: 0.2 mL)
Frozen. Separate specimens must be submitted when multiple tests are ordered.
Hemolyzed specimens or specimens other than heparin or EDTA plasma.
After separation from cells: Ambient: Unacceptable; Refrigerated: 1 week; Frozen at -20°C: 6 months
Thiamine (vitamin B1) is reported. However, thiamine diphosphate (TDP), the biologically active form of thiamine, is not found in measurable concentrations in plasma, and is best determined in whole blood specimens. Plasma thiamine concentration reflects recent intake rather than body stores.
Laboratory Developed Test (LDT)
Whole blood is the preferred specimen for thiamine assessment. Approximately 80 percent of thiamine present in whole blood is found in red blood cells. Refer to Vitamin B1 (Thiamine), Whole Blood (0080388).
|Component Test Code*||Component Chart Name||LOINC|
|0080389||Vitamin B1, Plasma||20468-5|
- B1 Vitamin
- Vitamin B1 (Thiamine),