Service Description

The Phenytoin/Dilantin test measures the level of phenytoin in the blood. Phenytoin is a common anti-seizure medication, and this test ensures the drug stays within the therapeutic range for effective seizure control and safety. Why it’s done: To monitor therapeutic drug levels To prevent phenytoin toxicity To assess medication effectiveness for seizure control To guide dosage adjustments To evaluate symptoms of underdosing or overdosing Specimen Type: Blood draw Turnaround Time: Typically 1–3 business days Collection Available: In-office or mobile blood draw services