Days Set Up
Monday - Friday
Analytic Time

5 - 8 days

MiChart Code
TPMT Genotype
Soft Order Code

Test Updated:


Thiopurine Methyltransferase (TPMT), Genetics
TPMT Genetics

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology
Test Usage

Genotypic test is for use prior to treatment, to help determine patient candidacy for AZA/6-MP therapy and to aid in individualizing patient dose.

Reference Range

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Please specify Prometheus TPMT Genetics. Collect specimen in a lavender top tube.

Collection Offsite

Please specify Prometheus TPMT Genetics. Collect specimen in a lavender top tube. Refrigerate and send intact specimen within 5 days of collection. Do not freeze.

Lavender Top Tube
Normal Volume
5 mL EDTA whole blood
Minimum Volume
1 mL EDTA whole blood

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.