Days Set Up
Tuesday, Friday
Analytic Time

4 hours

MiChart Code
Carbamazepine Epoxide
Soft Order Code

Test Updated:


Carbamazepine 10,11-epoxide
Tegretol Epoxide

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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.

Test Overview

Test Methodology


Test Usage

Monitor therapeutic drug level.

Reference Range

The concentration of carbamazepine epoxide is normally 10-40% that of the parent drug, but can be variable. During combination therapy the relative concentration of carbamazepine epoxide to carbamazepine may increase slightly.

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

Specimen Requirements

Collection Onsite

Collect blood in a red top tube; do not use SST.

Collection Offsite

Collect blood in a red top tube; do not use SST. Centrifuge, aliquot serum into a plastic vial and refrigerate.

Red Top Tube
Normal Volume
3 mL serum
Minimum Volume
1 mL serum

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.