Phenotype test used to optimize therapy for patients who are taking thiopurine drugs. Thiopurine metabolite concentrations are identified to assess therapeutic and toxic concentrations. If thiopurine therapy has not been initiated, order Thiopurine Methyltransferase, RBC (0092066).
Quantitative Liquid Chromatography/Tandem Mass Spectrometry
Trough collection (within 1 hour prior to the next dose).
Lavender (EDTA) or Pink (K2EDTA).
Transport 5 mL whole blood. (Min: 2.5 mL)
Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
Refrigerated. Send Sunday - Wednesday only.
Ambient: 24 hours; Refrigerated: 5 days; Frozen: Unacceptable
No compliance statements are in use for this test.
|Component Test Code*||Component Chart Name||LOINC|
- 6 Methyl Mercaptopurine
- Imuran Metabolite
Quest Diagnostics San Juan Capistrano Inc.