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Geisinger Medical Laboratories Test Catalog
TRYPTOPHAN |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB1360 Geisinger Epic ID: 53358 | |
SPECIMEN COLLECTION |
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Specimen type: |
Plasma | |
Preferred collection container: |
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Alternate Collection Container: |
3 mL lavender-top (K2 EDTA) tube
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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 |
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Specimen processing instructions: |
Plasma should be separated from cells as soon as possible after collection. Freeze plasma below -20ºC and ship frozen. | |
Transport temperature: |
Frozen. | |
Specimen stability: |
Room temperature: Unacceptable. Refrigerated: 7 days. Frozen: 30 days. | |
Rejection criteria: |
Gross hemolysis. | |
TEST DETAILS |
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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
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Clinical significance: |
Tryptophanuria is a rare autosomal recessive disease associated with mental retardation, neuropsychiatric dysfunction, and photosensitive skin rash. | |