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Tryptophan, Plasma
0099590
Ordering Recommendation
Mnemonic
TRYP
Methodology
Quantitative Liquid Chromatography-Mass Spectrometry
Performed
Varies
Reported
7-14 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Patient should fast overnight prior to collection (or at least 4 hours after a meal). Non-fasting specimens are acceptable for pediatric patients. 
Collect
Green (sodium heparin). Also acceptable: Lavender (EDTA) or green (lithium heparin). 
Specimen Preparation
Separate plasma from cells ASAP or within 2 hours of collection. Transfer 2 mL plasma to an ARUP Standard Transport Tube. (Min: 0.25 mL) 
Storage/Transport Temperature
Frozen. Also acceptable: Refrigerated. 
Unacceptable Conditions
Grossly hemolyzed. 
Remarks
N/A 
Stability
Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 1 month 
Reference Interval
By report
Interpretive Data
N/A

Note
N/A
CPT Code(s)
82131
Components
Component Test Code*Component Chart NameLOINC
0099590Tryptophan, Plasma20659-9
2003082Tryptophan, Date of Birth21112-8
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases

Performed at Quest Diagnostics