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

Stability

Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 28 days

Methodology

Liquid Chromatography - Tandem Mass Spectometry
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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
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Performing Laboratory

Quest SJC
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