Tryptophan
Test Summary
Tryptophanuria is a rare autosomal recessive disease associated with mental retardation, neuropsychiatric dysfunction, and photosensitive skin rash.
Aliases
- N/A
Specimen Collection
Special Instructions
N/A
Preferred Specimen
N/A
Minimum Volume
0.25 mL
Instructions
Date of birth must be provided. Plasma should be separated from cells as soon as possible after collection. Freeze plasma below -20ºC and ship frozen.
Patient Preparation
Collect plasma specimens after an overnight fast (or at least 4 hours after a meal) if possible.
Non-fasting samples are acceptable for pediatric patients.
Non-fasting samples are acceptable for pediatric patients.
Storage
Plastic screw-cap vial
Transport Temperature
Frozen
Specimen Stability
- Room temperature: Unacceptable
- Refrigerated: 7 days
- Frozen: 30 days
Limitations
N/A
Other Acceptable Specimens
Plasma collected in: EDTA (lavender-top) tube or lithium heparin (green-top) tube
Unacceptable Specimens
Gross hemolysis
Order Code
TRYPTO
EPIC (Premier) Code
LAB3492
Includes
N/A
CPT Code
- 82131
Billing Code
- 700000
CPT Statement
Methodology
Chromatography/Mass Spectrometry
FDA Status
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. The FDA has determined that such clearance or approval is not necessary. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Physician Attestation of Informed Consent
N/A
Testing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano CA, 92675
33608 Ortega Highway
San Juan Capistrano CA, 92675
Reference Range
| ≤30 days | 17-85 umol/L |
| 31 days-23 months | 16-92 umol/L |
| 2-17 years | 30-94 umol/L |
| ≥18 years | 40-91 umol/L |
Setup Schedule / Expected Turnaround Time
Tuesday, Thursday, Friday; Report available: 6 - 10 days
Specimen Collection
Special Instructions
N/A
Preferred Specimen
N/A
Minimum Volume
0.25 mL
Instructions
Date of birth must be provided. Plasma should be separated from cells as soon as possible after collection. Freeze plasma below -20ºC and ship frozen.
Patient Preparation
Collect plasma specimens after an overnight fast (or at least 4 hours after a meal) if possible.
Non-fasting samples are acceptable for pediatric patients.
Non-fasting samples are acceptable for pediatric patients.
Storage
Plastic screw-cap vial
Transport Temperature
Frozen
Specimen Stability
- Room temperature: Unacceptable
- Refrigerated: 7 days
- Frozen: 30 days
Limitations
N/A
Other Acceptable Specimens
Plasma collected in: EDTA (lavender-top) tube or lithium heparin (green-top) tube
Unacceptable Specimens
Gross hemolysis
Result Information
Methodology
Chromatography/Mass Spectrometry
Testing Laboratory
N/A
Reference Range
| ≤30 days | 17-85 umol/L |
| 31 days-23 months | 16-92 umol/L |
| 2-17 years | 30-94 umol/L |
| ≥18 years | 40-91 umol/L |
Setup Schedule / Expected Turnaround Time
Tuesday, Thursday, Friday; Report available: 6 - 10 days