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Thiopurine Methyltransferase Activity
MessagePatient Preparation: Blood is collected prior to azathioprine (Imuran) or 6-mercaptopurine (6-MP, Purinethol) therapy for screening purposes. The draw time is at physician's discretion. Ambulatory Transport Temperature to Inova Central Lab: Refrigerated Specimen Stability: 9 days
Test Code
LAB3642 TPMT3
Alias/See Also
TPMT3
CPT Codes
84433| 82657
Includes
@BKRCERMSGREFRESH(2302793)@ @BKRCERMSGREFRESH(2302794)@Patient Preparation: Blood is collected prior to azathioprine (Imuran) or 6-mercaptopurine (6-MP, Purinethol) therapy for screening purposes. The draw time is at physician's discretion.
Instructions
Processing Instructions: Ship at 2-8° C (Refrigerated ) within 24 hours of collection. Preferred Testing Volume: Two full EDTA (lavender-top) tubes whole blood Minimum Testing Volume: Two full EDTA (lavender-top) tubes whole blood Transport Temperature: Refrigerated (cold-packs) Stability: Ambient: 48 hoursRefrigerated : 9 daysFrozen: Unacceptable Causes for Rejection: HemolysisClottedAnimal specimenForensic specimenReceived frozenPerforming Lab: Quest SJC
Report Available
10-Days
Clinical Significance
1230170315
Last Updated: May 18, 2026