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 Field Name  Data Description
Test Name  Ethosuximide Level
Code  Ethosuximide Level Peak.
CPT Code  80168
Last Modified  4/23/2018 3:54:00 PM
Test Name  Ethosux.
Synonyms  Zarontin, TDM, peak
Patient Preparation  State other drugs taken by patient.
Spec. Requirements  Blood
Tube  Red (No Gel), Dark Green (Heparinized non gel tube), Lavender (EDTA),
Collection Volume  4.0 mL Red or Drk.Green, 2.0 mL Lavender
Storage  Ambient, Refrigerate, or Freeze 14 days
Routine TAT  
Days Test Performed  
Performed by BHS  None
See Availability  
Reference Lab  LabCorp of America
Reference Lab Code  007443 Ethosuximide (Zarontin), Serum
Clinical Use  Ethosuximide is an anticonvulsant used to treat seizures. Ethosuximide levels are monitored to assure adequate therapeutic levels are achieved and to avoid toxicity.
Reference Range  
Critical Value  
Reference Range  
Critical Value  
Testing Sample Type  Serum or Plasma
Min Lab Testing Volume  0.6 mL
Special Handling  Collection:Transfer separated serum or plasma to a plastic transport tube. Oral: peak: two to four hours after dose; trough: immediately prior to next dose. Peak or trough levels may be used to monitor therapy because blood levels are fairly constant.
Lab Notes  
Methodology  IA - Immunoassay
Limitations  Causes for Rejection: Gel-barrier tube; hemolysis; lipemia; gross bacterial contamination

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