Result of "BELOW" indicates that the result is below the method detection limit of 1 mcg/mL. The half-life is 40-60 hours in adults, 30-50 hours in children. Ethosuximide has been reported to cause elevation of serum phenytoin concentrations when two drugs are given concurrently. Concurrent therapy with valproic acid has been reported to cause elevations in ethosuximide concentrations.
This test was developed and its performance characteristics determined by the UWHC Clinical Laboratories. This test meets the standards for clinical testing. This test should not be regarded as investigational or for research use. The US Food and Drug Administration (FDA) has not approved or cleared this test; however, the FDA has determined that such clearance or approval is not necessary.