A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Tryptophan
Test Code959
Alias/See Also
LAB00328
TRYPTO
TRYPTO
CPT Codes
82131
Preferred Specimen
2 mL plasma collected in a sodium heparin (green-top) tube
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.
Minimum Volume
0.25 mL
Other Acceptable Specimens
Plasma collected in: EDTA (lavender-top) tube or lithium heparin (green-top) tube
Instructions
Separate plasma from cells as soon as possible and freeze below -20° C
Transport Container
Transport tube
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis
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 FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Tues, thurs-fri
Report Available
5-9 days
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 |
Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA |
33608 Ortega Highway |
San Juan Capistrano, CA 92675-2042 |