Test Details
Mnemonic
TRYPT
Ordering Code
3510790
CPT-4 Code(s)
82131
Specimen Information
Patient Preparation
Collect specimen after overnight fast or 4 hours after a meal. Non-fasting samples are acceptable for pediatric patients.
Collect
Green sodium heparin
Specimen Preparation
Centrifuge, separate plasma from cells and send 2.0 mL plasma in a screw capped plastic vial.
Alternate Specimen
Plasma: EDTA or lithium heparin
Minimum Volume
0.3 mL
Transport Temperature
Frozen
Rejection Criteria
Gross hemolysis
Room temperature samples
Room temperature samples
Stability
Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Liquid Chromatography - Tandem Mass Spectometry
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
31 days - 23 months: 16-92 umol/L
2 - 17 years: 30-94 umol/L
≤18 years: 40-91 umol/L
Performing Laboratory
Quest
New York DOH Approval Status
Yes