Collection Notes: Collect as a trough just before the next dose. Plasma should be physically separated from cells as soon as possible with a maximum limit of 2 hours from the time of collection. Centrifuge and physically separate the plasma using a plastic transfer pipette into a separate plastic transfer tube.
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 and to avoid toxicity.
Plasma (1 mL), EDTA
Ambient 5 Days
Refrigerated 10 Days
Frozen 30 Days
Plasma (1 mL), Lithium Heparin
Ambient 5 Days
Refrigerated 10 Days
Frozen 30 Days
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