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Levetiracetam, Serum or Plasma Mass Concentration

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 level helps your doctor adjust your dose for better seizure control."]

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

Key facts at a glance

LOINC
38159-0
Short code
levETIRAcetam Ur-mCnc
Synonyms
levETIRAcetam Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test to check if your levetiracetam levels are within the recommended range. This helps ensure the medication is working effectively and to avoid potential side effects from too much or too little in your system.

How the Test Works

A blood sample is taken from a vein in your arm. The lab then uses a specialized technique to measure the exact amount of levetiracetam in your serum or plasma.

What to Expect Before the Test

You can eat and drink normally before the test, but inform your doctor about any medications you’re taking, including over-the-counter drugs or supplements, as they may affect results.

What to Expect During the Test

The test involves a quick blood draw, usually done at a lab or your doctor’s office. You may feel a slight pinch, but it typically doesn’t cause discomfort beyond that.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally high or low levetiracetam levels can affect how well the medication controls seizures. High levels may increase the risk of side effects like dizziness or behavioral changes, while low levels might mean the medication isn’t working as intended. Regular monitoring helps balance safety and effectiveness.

Short name

Levetiracetam Level

Frequently asked questions

How often should I get this test?
Your doctor will determine the timing and frequency based on your treatment plan, typically after starting the medication or when making dose adjustments.
What do my results mean?
Results are usually compared to a reference range provided by your lab. If your level is outside this range, your doctor will discuss possible next steps, such as adjusting your dose or exploring alternative treatments.
Can I eat or drink before this test?
Yes, you can eat and drink normally before the test, but avoid alcohol or caffeine in excess, as they may influence your medication levels.
  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