ARUP Test Catalog
ARUP Consult Guide
Lab Tests Online
 
Thiopurine Methyltransferase (TPMT), RBC

Mnemonic:    [TPMT RBC]
Name:    Thiopurine Methyltransferase (TPMT), RBC
Specimen:    5 mL EDTA Lavender top tube. Send whole blood sample in the original collection container.

Alternative sample requirement: Lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin) WITHOUT gel.

Do NOT freeze the sample. Do NOT use gel tubes.
Minimum Spec:    3 mL
Transport Temp:    Refrigerated
Spec Stability:    Stable 6 days refrigerated.
Ref Lab/Code:    ARUP 0092066
  Method:    Enzymatic/High Performance Liquid Chromatography
Note:    This is the preferred screening test to detect individuals at high risk for myelosuppression when exposed to standard dose of thiopurines. INTENDED FOR PRETHERAPEUTIC EVALUATION ONLY.