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Levetiracetam, Serum/Plasma 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 levels helps doctors adjust your dose for better seizure control."]

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

Key facts at a glance

LOINC
48347-9
Short code
levETIRAcetam SerPl-sCnc
Synonyms
levETIRAcetam SerPl-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 doctor may order this test if you’re taking levetiracetam to manage seizures. It helps ensure the medication is working at the right level in your body. Blood samples are taken from a vein in your arm, usually during a regular clinic visit.

How the Test Works

Levetiracetam is detected using a specialized blood test that measures its concentration. The test checks how much of the drug is present in your serum or plasma, not in whole blood.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for a few hours before the test if instructed by your healthcare provider. Wear comfortable clothing and bring your medication list.

What to Expect During the Test

A healthcare professional will insert a small needle into your arm to draw blood. You may feel a brief pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal levels of levetiracetam can indicate whether your dose is too high or too low. Too little may mean seizures aren’t controlled, while too much could cause side effects like dizziness, fatigue, or mood changes. Regular monitoring helps balance effectiveness and safety.

Short name

Levetiracetam Level

Frequently asked questions

How often should I get this test?
Your doctor will determine the timing based on your treatment plan, typically every few weeks or months, depending on how your body responds to the medication.
What do my results mean?
Results are usually reported as a concentration value (e.g., micrograms per milliliter). Your doctor will interpret these results in relation to your medical history and symptoms to adjust your dose if needed.
Can I eat or drink before the test?
Follow your doctor’s instructions, but generally, you can eat a light meal unless they specify fasting for accuracy.
  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