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Levetiracetam Concentration in 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 plasma.

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
73310-5
Short code
levETIRAcetam ind plt IgM SerPl Ql FC
Synonyms
levETIRAcetam ind plt IgM SerPl Ql FC
Category
hematology
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 doctor may order this test if you’re taking levetiracetam to manage epilepsy or seizures. It helps ensure the medication is working at the right level in your body.

What to Expect Before the Test

You’ll likely have a small needle inserted into your arm or vein to draw a blood sample. The process is quick and usually painless. No special preparation is needed.

What the Results Mean

Results help your doctor check if your dose is appropriate. Too little may mean seizures aren’t controlled, while too much could increase side effects. Exact values depend on your treatment plan.

Common Side Effects to Watch For

Levetiracetam can cause side effects like dizziness, fatigue, or mood changes. If you experience severe reactions (e.g., rash, trouble breathing), contact your doctor immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring for Optimal Seizure Control

Short name

Levetiracetam Level

Frequently asked questions

How often do I need this test?
Your doctor will determine the frequency based on your treatment plan, seizure history, and how your body responds to the medication. Regular monitoring helps prevent both underdosing and overdosing.
Can diet or other medications affect this test?
Yes, certain foods, vitamins, or other medications (like some antacids) may interact with levetiracetam levels. Always inform your doctor about all supplements or medications you’re taking.
What if my results are outside the expected range?
If your levels are too high or too low, your doctor may adjust your dose or explore alternative treatments. Follow-up tests will be scheduled to monitor changes.
  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