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Phenytoin

Also known as: [Often referred to by brand name]
Formal name: Phenytoin, total and free
Related tests: Therapeutic Drug Monitoring; Emergency and Overdose Drug Testing

Why should I do it?
To determine phenytoin concentration in the blood, to maintain a therapeutic level, and to detect potential for toxicity

When should I do it?
At regular intervals to monitor; as needed to detect low or toxic concentrations

What Kind of Sample is Needed?
A blood sample drawn from a vein in your arm

Test Preparation Needed?
None