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TPMT - Thiopurine Methyltransferase

Tube Type

X 2

Test ID		LAB5769
EPIC Order		Thiopurine Methyltransferase (TPMT)
CPT Code(s)		84433
Group/Individual Test		Individual
Laboratory		Core Referral Testing
Tube Station		30
Specimen	Routine:	5 mL whole blood/lavender EDTA tubes (2 full tubes)/dark green sodium heparin tube also acceptable
	Micro:	3 mL blood
Availability	Routine:	Reference Laboratory - Mayo Clinic Laboratories
Turnaround Time		5-7 days
Reference Range	Normal:	See separate report

Reviewed by J. Carr on December 11, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514