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VITAMIN B1 (THIAMINE)
Number 1379
CPT Code 84425
Alias THIAMINE
Specimen Container Lavender Top
Specimen Type Whole Blood EDTA
Turn Around Time 
Days Performed 
Reference Range 66.5-200.0 nmol/L
Alternate Specimen 
Volume 1 mL Whole Blood
Stability Ambient Unstable
Stability Refrigerated 2 Days
Stability Frozen 7 Days
Patient Preparation 
Methodology 

High-pressure liquid chromatography (HPLC)

Limitations 

The biologically active form of the vitamin, thiamine diphosphate (TDP), 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.

Rejection Criteria 

Specimen not frozen (-20°C); plasma specimen; use of anticoagulants other than EDTA; specimen not protected from light

Additional Instructions 

Protect from light

Performing Laboratory Reference Laboratory
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COVID-19 Testing Guidance

Primex Clinical Laboratories strives to provide clients with quality testing services to better support patient health. With the ongoing pandemic, COVID-19 testing has become high in demand yet testing supplies are limited.

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COVID-19 Testing Guidance

Primex Clinical Laboratories strives to provide clients with quality testing services to better support patient health. With the ongoing pandemic, COVID-19 testing has become high in demand yet testing supplies are limited.

Read More