Specimen

Whole Blood

Collection Medium:

Alternate
Collection Media:

Lavender top tube (EDTA), Light Green top tube (Lithium Heparin), Pink 
top tube (EDTA sprayed)

Minimum:

Adult preferred minimum: 3 mL whole blood from green top (NA Heparin) 
tube.
Adult absolute minimum: 1 mL whole blood from green top (NA Heparin) 
tube.
Pediatric minimum: 0.7-1.0 mL whole blood from lavender top (EDTA) tube

Delivery Instructions:

Wrap specimen in aluminum foil to protect from light.  
Deliver to laboratory immediately after collection.

Specimen
Instructions:

Whole Blood is sample of choice.

Analytic Time:

6 days

Reference Range:

70-180 nmol/L

Interpretive Data:

The concentration of thiamine diphosphate (TDP), the primary active 
form of vitamine B1, is measured in this assay.  Approximately 90% of 
vitamine B1 present in whole blood is TDP.  Thiamine and thiamine 
monophosphate, which comprise the remaining 10%, are not measured.

Methodology:

High Performance Liquid Chromatography

CPT Code:

84425

See Additional Information:
Specimens Requiring Immediate Delivery