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
New York DOH Approval Status
Lavender (K2 or K3EDTA).
Transport 3 mL whole blood in the original collection tube. (Min: 1.5 mL)
Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
Ambient: 24 hours; Refrigerated: 8 days; Frozen: Unacceptable
Performed by non-ARUP Laboratory
|Component Test Code*||Component Chart Name||LOINC|
- 6 Methyl Mercaptopurine
- Imuran Metabolite
- Purine antimetabolites
- Thiopurine Metabolites
Mayo Clinic Laboratories