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22443 Ethosuximide, Serum (ETX)

Ethosuximide, Serum (ETX)
Test Code: ETHOSO
Synonyms/Keywords
Zarontin®​
Useful For

​Monitoring ethosuximide therapy

Dertermining compliance

Assessing ethosuximide toxicity

Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Serum Separator Tube (SST) ​Red Top Tube (RTT) 0.5 mL ​0.25 mL ​
Collection Processing Instructions
Serum gel tubes should be centrifuged within 2 hours of collection.
Red Top Tubes should be centrifuged and aliquoted within 2 hours of collection.
Specimen Stability Information
Specimen Type Temperature Time
​Serum ​
Ambient 
 ​14 days
Refrigerated (preferred) 14 days
​Frozen ​28 days
Rejection Criteria
​Gross Hemolysis
Performing Laboratory Information
Performing Location Day(s) Test Performed Report Available Methodology/Instrumentation
Mayo Clinic Laboratories​ Monday through Saturday ​1 day
Enzyme-Multiplied Immunoassay Technique (EMIT)
Reference Lab
Mayo Clinic Laboratories
Test Information
 
Reference Range Information
Performing Location Reference Range
Mayo Clinic Laboratories
​Therapeutic: 40-100 mcg/mL
Critical value: >150 mcg/mL
Interpretation
​Dosage is guided by blood levels; the therapeutic range for ethosuximide is 40 to 100 mcg/mL.
 
Toxic concentration: above 120 mcg/mL.
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80168 ​ ​ ​ ​
Synonyms/Keywords
Zarontin®​
Ordering Applications
Ordering Application Description
​Centricity ​Ethosuximide
​Cerner ​Ethosuximide Level (48)
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Serum Separator Tube (SST) ​Red Top Tube (RTT) 0.5 mL ​0.25 mL ​
Collection Processing
Serum gel tubes should be centrifuged within 2 hours of collection.
Red Top Tubes should be centrifuged and aliquoted within 2 hours of collection.
Specimen Stability Information
Specimen Type Temperature Time
​Serum ​
Ambient 
 ​14 days
Refrigerated (preferred) 14 days
​Frozen ​28 days
Rejection Criteria
​Gross Hemolysis
Useful For

​Monitoring ethosuximide therapy

Dertermining compliance

Assessing ethosuximide toxicity

Reference Range Information
Performing Location Reference Range
Mayo Clinic Laboratories
​Therapeutic: 40-100 mcg/mL
Critical value: >150 mcg/mL
Interpretation
​Dosage is guided by blood levels; the therapeutic range for ethosuximide is 40 to 100 mcg/mL.
 
Toxic concentration: above 120 mcg/mL.
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Report Available Methodology/Instrumentation
Mayo Clinic Laboratories​ Monday through Saturday ​1 day
Enzyme-Multiplied Immunoassay Technique (EMIT)
Reference Lab
Mayo Clinic Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80168 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.