Levetiracetam (Serum or Plasma Concentration)

Why This Test Is Done

Your healthcare provider may order this test to check if your levetiracetam levels are within the recommended range. This helps prevent seizures from returning or causing side effects like dizziness, fatigue, or mood changes. It may also be done if you’re experiencing unusual symptoms while taking the medication.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into a vein (venipuncture) in your arm, or a blood sample may be collected from a finger. If you’re taking levetiracetam orally, your blood sample will be taken at a time that matches your usual dosing schedule.

What the Test Results Mean

Results are typically reported as the concentration of levetiracetam in your blood. Your provider will compare these results to the standard range for your age and health condition to determine if your dose needs adjustment. Very high or very low levels can indicate issues with how your body processes the medication.

Possible Side Effects and Risks

While rare, very high levetiracetam levels may cause serious side effects like confusion, difficulty breathing, or even seizures. Very low levels might mean your seizures aren’t well controlled. Your provider will monitor your results closely and adjust your dose as needed.