Vitamin B1 VB1

Synonyms
Allscripts (AEHR) Order Name	Vitamin B1, Whole Blood
Sunrise Clinical Manager (SCM) Order Name	Vitamin B1, Serum
EPIC Order Name	Vitamin B1 (Thiamine)
Clinical Info	For the assessment of thiamine deficiency
Specimen Type	Blood
Specimen Volume
Container	Lavender Top Tube
Collection Instructions	Container/Tube: Lavender-top (EDTA) tube Specimen Volume: 1mL (minimum volume: 0.5mL) of whole blood. Transport Temperature: Frozen whole blood Collection Instructions: Blood samples should be collected before breakfast in the morning and prior to any medication. Draw blood. Do not separate. Transfer to a plastic transport tube. Freeze Stability: 14 days Frozen
Transport Instructions	Frozen whole blood
Specimen Stability	14 days Frozen
Methodology	Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Days Performed	Monday through Friday
Performing Laboratories	LabCorp of America
CPT	84425 LOINC: 32554-8
PDM	5901345
Result Interpretation 66.5-200.0 nmol/L The biologically active form of the vitamin, thiamine pyrophosphate (TPP), is best measured in whole blood and is not found in measurable concentration in plasma. Plasma thiamine concentration reflects recent intake rather than body stores; therefore, whole blood is the preferred specimen for thiamine assessment. Approximately 80% of thiamine present in whole blood is found in red blood cells. This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).
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