Days Set Up
Daily
Analytic Time

4 hours

MiChart Code
Ethosuximide Level
Soft Order Code
ESXD

Test Updated:

Synonyms

Zarontin
ESXD
ETHOSUXIMIDE
ETHOSUXIMIDE LEVEL

+ See More

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

Gas Chromatography (GC)

Test Usage

Monitor therapeutic drug levels

Reference Range

40-100 mcg/mL, Toxic > 150 mcg/mL.

* 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 tube. Lavender top or Green top tube is also acceptable.

Collection Offsite

Collect blood in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate. Heparinized or EDTA plasma is also acceptable.

Yellow Top Tube
Red Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
80168
Pro Fee Code
 
LOINC
3616-0

Have More Questions?

Explore our helpful billing resources:

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.

LEARN MORE