Vitamin B1 (Thiamine), LC/MS/MS, Plasma or Serum : 1015304

Test Code
VB1Q or 1015304

Alias/See Also
B1,Thiamine

CPT Codes
84425

Instructions
Overnight fasting is required.

Lavender EDTA tube or plain red tube.

Transport Container
Keep tube light protected after collection. Centrifuge lavender top or plain red tube (allow plain red to clot 20-30 minutes) ASAP and transfer 2 mL plasma or serum within 4 hours of collection to an amber transport tube (preferred) or protect the transport tube from light with foil or place in an amber bag. (Min: 1 mL) The separation from the cells must be completed within 4 hours of collection. Keep the specimen cold and light protected. Freeze aliquot immediately.

Transport Temperature
Frozen.

Specimen Stability
Ambient: 8 hours; Refrigerated: 48 hours; Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis; Lipemia; Received room temperature; Not protected from light; Specimens collected in gel barrier tube or tubes other than lavender-top or red-top (no gel).

Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Setup Schedule
Tuesday - Saturday

Report Available
2-3 days (From receipt at performing laboratory)

Reference Range
Adult: 8-30 nmol/L

Clinical Significance
Vitamin B1 deficiency is most often associated with alcoholism, chronic illness and following gastric by-pass surgery. Prolonged deficiency causes beriberi. Plasma vitamin B1 is useful in evaluating nutritional assessment and compliance, while whole blood vitamin B1 is useful in evaluating body stores.

Performing Laboratory
Quest Diagnostics



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.