what is tpmt enzyme test
A Guide to the TPMT Lab Test. written by: angiem1981â¢edited by: Diana Cooperâ¢updated: 7/5/2011. The TPMT lab test, or the Thiopurine methyltransferase test, is a blood test used to check levels of the enzyme thiopurine before beginning certain therapies.This test can indicate whether or not thiopurine drugs will be an effective and safe treatment for the patient.slide 1 of 6. Guide to the TPMT Lab Test. written by: angiem1981â¢edited by: Diana Cooperâ¢updated: 7/5/2011. The TPMT lab test, or the Thiopurine methyltransferase test, is a blood test used to check levels of the enzyme thiopurine before beginning certain therapies.