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25218 Thiamine (Vitamin B1), Whole Blood

Thiamine (Vitamin B1), Whole Blood
Test Code: TOTHIA
Synonyms/Keywords
​Thiamin, Vitamin B1, Thiamine
Useful For
  • To evaluate Thiamine (Vitamin B1) in whole blood. Deficiency can cause a range of clinical manifestations including poor sleep, malaise, weight loss, irritability and confusion. Sever deficiency may result in Beriberi, Wernicke encephalopathy, Korsakoff's psychosis and Wernicke-Korskoff syndrome.
Specimen Requirements
Fasting​ Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Yes​ Whole blood​ ​Lavender top tube (LTT) ​ ​1 mL ​0.5 mL ​
Collection Processing Instructions

​Protect from light.

Patient should be fasting for at least 9 hours.

Specimen Stability Information
Specimen Type Temperature Time​
​Whole Blood ​ ​Frozen (preferred) 2 Months​
​Refrigerate 1 Week​
Rejection Criteria
Samples not drawn in the required lavender top tube anticoagulant.
Specimens stored at room temperature > 2 hours.
Performing Laboratory Information
Performing LocationDay(s) Test PerformedAnalytical TimeMethodology/Instrumentation
​Marshfield

​1 day/week: Monday
(results on Tuesday)

2-3 days​
UPLC-MS MS (Waters TQ-S System)​
Samples must be in performing department by 8am on day of testing for results the same day.​ ​ ​ ​​ ​ ​ ​
Test Information
This test was developed and its performance characteristics determined by Marshfield Labs.  It has not been cleared or approved by the US Food and Drug Administration.  This test is used for clinical purposes.  It should not be regarded as investigational or for research.
Reference Range Information
Performing Location Reference Range
​Marshfield
100-205 nmol/L​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​84425 ​ ​ ​ ​
Synonyms/Keywords
​Thiamin, Vitamin B1, Thiamine
Ordering Applications
Ordering Application Description
​COM Thiamine (Vitamin B1), Total in Whole Blood
​Cerner ​Thiamine (Vit B1), Whole Blood
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting​ Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Yes​ Whole blood​ ​Lavender top tube (LTT) ​ ​1 mL ​0.5 mL ​
Collection Processing

​Protect from light.

Patient should be fasting for at least 9 hours.

Specimen Stability Information
Specimen Type Temperature Time​
​Whole Blood ​ ​Frozen (preferred) 2 Months​
​Refrigerate 1 Week​
Rejection Criteria
Samples not drawn in the required lavender top tube anticoagulant.
Specimens stored at room temperature > 2 hours.
Useful For
  • To evaluate Thiamine (Vitamin B1) in whole blood. Deficiency can cause a range of clinical manifestations including poor sleep, malaise, weight loss, irritability and confusion. Sever deficiency may result in Beriberi, Wernicke encephalopathy, Korsakoff's psychosis and Wernicke-Korskoff syndrome.
Reference Range Information
Performing Location Reference Range
​Marshfield
100-205 nmol/L​
For more information visit:
Performing Laboratory Information
Performing LocationDay(s) Test PerformedAnalytical TimeMethodology/Instrumentation
​Marshfield

​1 day/week: Monday
(results on Tuesday)

2-3 days​
UPLC-MS MS (Waters TQ-S System)​
Samples must be in performing department by 8am on day of testing for results the same day.​ ​ ​ ​​ ​ ​ ​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​84425 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.