1 Red Top/1.0 mL serum. After 30 minutes of clotting, promptly centrifuge, separate and refrigerate. Do not collect in serum separator tube.
Alternate Specimen: LAV/EDTA
Room Temperature 48 hours; Refrigerated 14 days; Frozen 14 days
For therapeutic drug monitoring of anticonvulsant drug. Peak concentrations are reached in 1-4 hours after oral administration. Elimination half-life is 30-40 hours.