Vitamin B1 (Thiamine)
Draw blood in a Lavender (EDTA) tube. Transfer 1.0 mL whole blood to a screw-capped plastic vial (indicate whole blood and tube type on vial) and freeze. Contact lab for dry ice; once received, ship frozen specimen to lab.
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Frozen 14 Days
For the assessment of thiamine deficiency.