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Vitamin B1 (Thiamine), Blood, LCMSMSTest Code
2 mL whole blood collected in an EDTA (lavender-top) tube - protect from light
Transfer whole blood to a plastic shipping vial to prevent breakage. Wrap tube in aluminum foil to protect from light. Freeze immediately. Samples received frozen (in a closed container) but not protected from light are acceptable.
Wrap sample in foil before sending to lab; no disclaimer is required.
Plastic screw-cap vial protected from light
Room temperature: 72 hours
Refrigerated: 5 days
Frozen: 35 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples received refrigerated, but not protected from light
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Adults: 78-185 nmol/L
Vitamin B1 is required for branched-chain amino acid and carbohydrate metabolism. Vitamin B1 deficiency is most often due to alcoholism or chronic illness. In the early stage, patients with vitamin B1 deficiency exhibit anorexia, irritability, apathy, and generalized weakness. Prolonged deficiency causes beriberi.
Quest Diagnostics Nichols Institute