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Test Code
WBVB1
Test Name
Vitamin B1, Whole Blood
CPT Codes
84425
Expected Turnaround Time
3 - 5 days
Clinical Utility

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.
Specimen and Container Info

Specimen Type: Whole Blood (light protected)

  

Collection Container: Lavender Top (EDTA)

Desired Specimen Volume: 2 mL
Collection Instructions

Testing requires WHOLE BLOOD protected from light.

  1. Collect a lavender top (EDTA) tube via venipuncture.
Processing and Submission Instructions
  1. Transfer 2 mL of whole blood to an amber aliquot tube (screw cap).
  2. If an amber aliquot is not available, wrap the original collection tube and cap in aluminum foil.
  3. Specimen must be protected from light.
Patient Preparation

Overnight fasting is required.

Vitamin supplementation within 24 hours prior to blood draw may affect the accuracy of the results.

Transport Instructions

Transport to the laboratory frozen. 
Stability Requirements

Room Temperature

 8 hours

Refrigerated

 5 days

Frozen

35 days

Freeze/Thaw Cycles

 Stable x6
Methodology
Chromatography/Mass Spectrometry
Reference Intervals

See patient report.
Alternate Names
  • B1 Vitamin, Whole Blood
  • Thiamine, Whole Blood
  • Vitamin B1 (Thiamine), Blood, LC/MS/MS
  • Thiamine,B1
Reference Lab
Quest Diagnostics Nichols Institute
Testing Schedule
Routine, Monday - Saturday
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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