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Also known as: [Often referred to by brand name. See MedlinePlus Medical Drug Information]
Formal name: Phenytoin, total and free

At a Glance

Why Get Tested?

To determine the level of the drug phenytoin in your blood in order to maintain a therapeutic level and to detect potential for toxicity

When to Get Tested?

At regular intervals to monitor; as needed to detect low or toxic concentrations

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?