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Levetiracetam [Mass concentration] in Serum or Plasma by Immunoassay

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

This test measures the amount of levetiracetam, an anti-seizure medicine, in your blood to help your care team make sure the dose is right for you.

Quick summary

["A levetiracetam level helps confirm your medication dose is in a helpful range and not too high or too low."]

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

Key facts at a glance

LOINC
73311-3
Short code
levETIRAcetam ind plt IgG SerPl Ql FC
Synonyms
levETIRAcetam ind plt IgG 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

What This Test Measures

Levetiracetam is a prescription medicine used to prevent and control certain types of seizures. This blood test measures how much of the medicine is present in your serum or plasma, the liquid part of your blood.

Why Your Clinician May Order It

Levels can vary from person to person based on age, kidney function, other medicines, and how your body processes the drug. Checking the level can help your clinician adjust your dose, especially if seizures continue or if you have side effects.

How the Sample Is Collected

A healthcare professional draws a small blood sample, usually from a vein in your arm, into a tube. The sample is then processed to separate serum or plasma, which is analyzed.

What the Method Means

The test uses an immunoassay, a common laboratory method that uses antibodies to detect and measure specific substances. Results are reported as a concentration and are interpreted alongside your dose timing and clinical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Levetiracetam levels support individualized dosing for seizure control. Results are most useful when the timing of your last dose is known, because levels rise and fall between doses. Your clinician considers the result together with your symptoms, kidney function, other medications, and treatment goals. This test does not by itself diagnose epilepsy or determine whether a seizure disorder is controlled.

Short name

Levetiracetam level

Frequently asked questions

Do I need to fast or change my dose before this test?
Usually no fasting is required, but timing matters because the level depends on when you last took your medicine. Follow your clinician's instructions about when to draw the sample and never stop or change your dose on your own.
What can affect my levetiracetam level?
Kidney function, age, body size, other medicines, and the timing of your last dose can all affect the result. Tell your clinician about all medicines and supplements you take.
What happens if my level is outside the expected range?
Your clinician will interpret the result with your symptoms and treatment response. An out-of-range level may lead to a dose adjustment or further monitoring, but it is not an emergency by itself unless you have concerning symptoms.
  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