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Levetiracetam in Serum or Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of levetiracetam, a medication used to control certain types of seizures, in your blood.

Quick summary

Knowing your levetiracetam levels helps your doctor monitor your dose for optimal seizure control.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
73005-1
Short code
levETIRAcetam (neut) IgM SerPl Ql FC
Synonyms
levETIRAcetam (neut) IgM SerPl Ql FC
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking levetiracetam to check if the medication is working properly. It can also help adjust your dose if you experience side effects or changes in seizure control.

What to Expect Before the Test

No special preparation is needed. A blood sample is taken from a vein in your arm, usually by a healthcare professional. You may feel a slight pinch, but it shouldn’t cause discomfort.

What the Results Mean

Results help your doctor determine if your current dose is effective. Abnormal levels may indicate issues like poor absorption, liver problems, or drug interactions.

Common Reasons for Testing

This test is often done during routine follow-ups, after changes in medication, or if you experience new side effects like dizziness, fatigue, or mood changes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Levetiracetam levels are critical for managing epilepsy. Too little may mean seizures aren’t controlled, while too much can lead to toxicity, affecting coordination, mood, or causing rare but serious side effects. Regular monitoring helps balance safety and effectiveness.

Short name

Levetiracetam Level

Frequently asked questions

What does a ‘normal’ result mean?
There’s no single ‘normal’ range for levetiracetam because it varies based on your weight, kidney function, and other medications. Your doctor will interpret results in the context of your health and treatment plan.
Can diet or other medications affect this test?
Yes. Some foods, vitamins, or other antiseizure medications may interact with levetiracetam. Always tell your doctor about all medications, supplements, or dietary changes before testing.
How soon will I get my results?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will discuss them with you during your next visit or call if urgent.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy