Lab Test

Thiamin, Blood

Vitamin B1, Thiamine

Test Codes

EPIC: LAB6159, Beaker: XTHWB1, Warde: VB1WB


Send Outs


Do not use this test to monitor thiamine supplementation. Use this test to determine thiamine deficiency.

Specimen Collection Criteria

Collect: One Lavender- top EDTA (primary tube).

Physician Office/Draw Specimen Preparation

Protect specimen from light. Do not centrifuge.

  • Pour whole blood over into light- protected transport tube and freeze (-20°C/-4°F or below)
  • If unable to pour over, keep refrigerated and protected from light. Stable up to 6 hours.

Also acceptable: Frozen Lavender EDTA (primary tube) protected from light.

Preparation for Courier Transport

Transport: 2.0 mL light-protected whole blood, refrigerated (2-8°/36-46°F or below). (Minimum: 1.0 mL).

For pour over or frozen lavender EDTA (primary tube) specimens keep frozen (-20°C/-4°F or below) and protected from light.

Rejection Criteria

  • Clotted specimens.
  • Centrifuged specimens.
  • Specimens not light-protected.
  • Specimens not collected and processed as indicated.

In-Lab Processing

Protect specimen from light. Do not centrifuge. Pour whole blood over into light-protected transport tube.

Frozen Lavender (EDTA) specimen (primary tube) acceptable to send to reference lab, only if protected from light.

Transport: 2.0 mL light-protected whole blood, frozen (-20°C/-4°F or below). (Minimum: 1.0 mL).


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 6 hours
Frozen (-20°C/-4°F or below): 2 months

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.


Sent to Warde Medical Laboratory, Ann Arbor, MI.


Monday – Friday.
Results available in 3-6 days.

Reference Range

By report.

Test Methodology

Quantitative High Performance Liquid Chromatography (HPLC).

CPT Codes



Last Updated


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