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HelpTest Code TDP Thiamine (Vitamin B1), Whole Blood
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.
CMH COLLECTION: 3 mL in EDTA lavender vacutainer
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole Blood EDTA | Frozen | 28 days | LIGHT PROTECTED |
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
Reject Due To
| Gross lipemia | Reject |
| Glass vial Clotted specimen |
Reject |
Day(s) Performed
Monday through Friday
Report Available
3 to 6 daysReporting Name
Thiamin (Vitamin B1), WBReference Values
70-180 nmol/L
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84425