Test Overview

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.

Test Details

Days Test Performed

Monday - Friday

Analytic Time

5 - 8 days

Soft Order Code


MiChart Code

TPMT Genotype



Thiopurine Methyltransferase (TPMT), Genetics
TPMT Genetics

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Laboratory Reference

Prometheus 3300

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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.

Specimen Requirements

Offsite Collection Instructions

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

Additional Information

Test sent to Prometheus Labs.

Billing Information

Fee Codes

CPT Code


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