Geisinger Medical Laboratories Test Catalog

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Test Search:      Test Name: OR Test Code OR CPT Code:  


Test code:
Specimen type:
Plasma (preferred) or serum.
Preferred collection container:
Specimen Required:
2 mL aliquot of plasma (preferred) or serum; minimum 1 mL. Please submit a separate frozen aliquot for this test. It may not be combined with any other test requiring a frozen aliquot.
Special notes:
Preferred specimen is plasma collected in EDTA tube (TWO 2 mL tubes or or one 6 mL tube), or green-top sodium or lithium heparin tube. Serum in plain red-top (nonserum separator tube) also acceptable. Serum separator tubes are NOT acceptable. Wrap tube in aluminum foil to protect from light.
Patient preparation:
Overnight fasting is preferred. Patient is to be restricted from alcohol, coffee, tea, raw fish, liver, pork, sausage, and vitamins for at least 24 hours before sample collection

Specimen processing instructions:
Centrifuge 10 minutes at 3000 rpm. Freeze plasma or serum specimens immediately after separating from cells. 
Transport temperature:
Protected from light; frozen.
Specimen stability:
Room Temperature: 24 hours. Refrigerated: 48 hours. Frozen: 1 month.
Rejection criteria:
Samples not received frozen and not protected from light. Specimens collected in serum separator tubes, lipemic and hemolyzed specimens will also be rejected

Reference interval:
Adults 8-30 nmol/L.
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Vitamin B1.
Liquid Chromatography/Tandem Mass Spectrometry

Performing Locations

Quest Diagnostics
Technical Lead: Michael Weaver    
Frequency: Monday, Wendesday, Friday morning    
Performed stat? N
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