Test ID: Z0260
CPT code: 80168
LOINC: 3616-0
Specimen Type: Red, Lav(EDTA) OR green(heparin). NO SST
Frequency: 1 – 3 days
Instructions: 1 mL Serum or Plasma from Red, Lav(EDTA) OR green(heparin). NO SST, Ambient. Min 0.6 mL.
Text: Used to evaluate toxicity; monitor therapeutic levels. As is with other antiepileptic drugs metabolized by the P450 enzyme system, co-administration of carbamazepine, phenytoin, phenobarbital, or primidone will result in decreased ethosuximide levels, whereas valproic acid can increase ethosuximide levels.
Methodology: Immunoassay