Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  

TRYPTOPHAN

ORDERING INFORMATION:
Geisinger Epic Procedure Code: LAB1360         Geisinger Epic ID: 53358

SPECIMEN COLLECTION
Specimen type:
Plasma
Preferred collection container:
Alternate Collection Container:
3 mL lavender-top (K2 EDTA) tube
Specimen required:
2 mL plasma; minimum 0.25 mL.
Special notes:
Date of birth must be provided.
Patient preparation:
Collect plasma specimens after an overnight fast (or at least 4 hours after a meal). Non-fasting samples are acceptable for pediatric patients.

SPECIMEN PROCESSING
Specimen processing instructions:
Plasma should be separated from cells as soon as possible after collection. Freeze plasma below -20ÂșC and ship frozen. 
Transport temperature:
Frozen.
Specimen stability:
Room temperature: Unacceptable. Refrigerated: 7 days. Frozen: 30 days.
Rejection criteria:
Gross hemolysis.

TEST DETAILS
Additional information:
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
CPT code(s):
82131
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.
Synonyms:
Quest test code 959
Clinical significance:
Tryptophanuria is a rare autosomal recessive disease associated with mental retardation, neuropsychiatric dysfunction, and photosensitive skin rash.

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Set up: Tues, Thurs, Fri; Report available: 6-10 days    
Performed stat? No
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