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Labcorp Oklahoma, Inc.
Test Directory


Narcolepsy HLA Evaluation

Order Name NARCO HLA
Test Number: 5194340
Revision Date 12/12/2022
Test Name Methodology LOINC Code
Narcolepsy HLA Evaluation
Polymerase Chain Reaction  
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 7 mL (3 mL) EDTA Whole Blood EDTA (Lavender Top) Room Temperature
Alternate 1 See Instructions Buccal swab See Instructions See Instructions
Instructions Notes: 3 mL or four buccal swabs
Specimen Type: Lavender-top (EDTA) tube or four buccal swabs in a sealed envelope (buccal swab kit). If submitting buccal swabs, please use the kit provided by LabCorp. To obtain the buccal swab kit or to discuss other specimen types, please telephone 800-533-1037.
Specimen Storage: Maintain specimen at room temperature. Protect from extreme heat or cold.
Specimen Collection: Not Available
Special Instructions: If you have questions, please telephone HLA customer service at 800-533-1037 for assistance in selecting the appropriate HLA test for the patient.
Specimen Stability: Ambient: Not Available, Refrigerated : Not Available, Frozen: Not Available
Expected TAT 3 - 7 days  
Clinical Use HLA DQB1*06:02 and HLA DQA1*01:02 are associated statistically with narcolepsy and are sometimes used as tests in support of that diagnosis. 
Performing Labcorp Test Code 167139 
Notes Labcorp Test Code: 167139
CPT Code(s) 81383x2
Lab Section Reference Lab