Sign in →

Test Code TDP Thiamine (Vitamin B1), Whole Blood

Important Note

  • Thiamine can be collected at all sites. It will be frozen as soon as possible after it reaches Specimen Processing.
  • Patient must be fasting 12-24 hours
  • Must invert the collection tube 8-10 times
  • PROTECT FROM LIGHT/ must freeze immediately.
  • Place a notice on the orange Courier box: "Specimen for Immediate Freezing Inside"
  •  (Processors: Specimen should be frozen immediately upon receipt in the Lab. Be sure to mix well before placing in the freezer)

Useful For

Assessment of thiamine deficiency

 

Measuring thiamine levels in patients with behavioral changes, eye signs, gait disturbances, delirium, and encephalopathy; or in patients with questionable nutritional status, especially those who appear at risk and who also are being given insulin for hyperglycemia

Method Name

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

Reporting Name

Thiamin (Vitamin B1), WB

Specimen Type

Whole Blood EDTA


Shipping Instructions


Ship specimen in amber vial or tube to protect from light.



Specimen Required


Patient Preparation:

1. Patient should fast overnight (12-14 hours); infants should have specimen collected just before next feeding. Water can be taken as needed.

2. For 12 hours before specimen collection, patient should not take vitamin supplements.

Supplies: Amber Frosted Tube, 5 mL (T915)

Collection Container/Tube: Lavender top (EDTA)

Submission Container/Tube: Amber vial

Specimen Volume: 4 mL

Collection Instructions:

1. Invert 8 to 10 times to mix blood.

2. Transfer whole blood into amber vial or tube and freeze within 24 hours of collection.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole Blood EDTA Frozen 28 days LIGHT PROTECTED

Reference Values

70-180 nmol/L

Interpretation

Values for thiamine diphosphate of less than 70 nmol/L are suggestive of thiamine deficiency.

Clinical Reference

1. Naidoo DP, Bramdev A, Cooper K. Wernicke's encephalopathy and alcohol-related disease. Postgrad Med J. 1991;67(793);978-981

2. Herve C, Beyne P, Letteron PH, Delacoux E. Comparison of erythrocyte transketolase activity with thiamin and thiamin phosphate ester levels in chronic alcoholic patients. Clin Chim Acta. 1995;234(1-2):91-100

3. Majumdar SK, Shaw GK, O'Gorman P, et al. Blood vitamin status (B1, B2, B6, folic acid, and B12) in patients with alcohol liver disease. Int J Vitam Nutr Res. 1982;52:266-271

4. Ball GFM. Vitamins: Their role in the human body. Blackwell Publishing; 2004:273-288

5. Brin M. Erythrocyte as a biopsy tissue for functional evaluation of thiamin adequacy. JAMA. 1964;187:762-766

6. Roberts NB, Taylor A. Sodi R. Vitamins and trace elements. In: Rifai N, Horwath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 6th ed. Elsevier; 2018:639-718

7. Sodi R. Vitamins and trace elements. In: Rifai N, Chiu RWK, Young I, Burnham CAD, Wittwer CT, eds. Tietz Textbook of Laboratory Medicine. 7th ed. Elsevier; 2023:417

Day(s) Performed

Monday through Friday

Report Available

3 to 6 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

84425

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TDP Thiamin (Vitamin B1), WB 32554-8

 

Result ID Test Result Name Result LOINC Value
85753 Thiamin (Vitamin B1), WB 32554-8

Forms

If not ordering electronically, complete, print, and send a General Request (T239) with the specimen.