Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

ETHOSUXIMIDE LEVEL

General Information

Lab Order Codes:

ZAR

Synonyms:

Zarontin®

CPT Codes:

80168 - Ethosuximide

Test Includes:

Ethosuximide level reported in mcg/mL.

Logistics

Test Indications:

Monitoring therapy, determining compliance, assessing toxicity

Lab Testing Sections:

Chemistry - Sendouts

Referred to:

MedTox Laboratories (MedTox Test: 48)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 day, test performed daily

Special Instructions:

Trough levels are most reproducible.

Specimen

Specimen Type:

Blood

Container:

Red (plain, no gel) top tube

Alternate: Green top tube

Draw Volume:

3 mL (Minimum: 1.2 mL) blood

Processed Volume:

1 mL (Minimum: 0.4 mL) serum

Collection:

Routine venipuncture

Special Processing:

Lab Staff: Centrifuge specimen, remove plasma aliquot into a screw-capped round bottom plastic vial within 2 hours of draw. Store and ship at refrigerated temperatures. Forward promptly.

Minimum volumes may result in an elevated reporting limit and inability to repeat analysis.

Patient Preparation:

None

Sample Rejection:

Gross hemolysis; mislabeled or unlabeled specimens

Interpretive

Reference Range:

Therapeutic range: 40 – 100 mcg/mL

Toxic Values:

> or = 150 mcg/mL

Limitations:

Minimum volumes may result in an elevated reporting limit and inability to repeat analysis. Reporting limit 1.0 mcg/mL.

Methodology:

Immunoassay Technique (IA)

References:

MedTox Laboratories July 2012

Updates:

3/4/2004: Test moved from Medtox to Mayo Medical Laboratories. Note: Change in upper therapeutic range from 100 to 75. Toxic range previously >150.
1/28/2010: Units changed from ug/mL to mcg/mL. Critical/Toxic value changed from ≥100 mcg/mL to >100 mcg/mL.
1/5/2011: Test moved from Mayo to MedTox. Toxic range previously listed >100 mcg/mL.



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