Collection Notes: Collect as a trough just prior to the next dose. Serum must be collected in a red top (no gel) tube. Plasma is not acceptable.
Clinical Utility: Phenytoin is used for the treatment of grand mal and complex partial seizures. Phenytoin levels are monitored to assure adequate therapeutic levels are achieved. Toxic levels are equal to or greater than 3.5mg/L.
Serum (1 mL)
Ambient 4 Days
Refrigerated 7 Days
Frozen 30 Days
Enter your information below