Skip to content

Topiramate Concentration in Serum/Plasma

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

This test measures the amount of topiramate, a medication used to treat epilepsy and migraine, in your blood.

Quick summary

["Checks if your topiramate dose is within the recommended range for your condition."]

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

Key facts at a glance

LOINC
72939-2
Short code
Topiramate (neut) IgM SerPl Ql FC
Synonyms
Topiramate (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 doctor may order this test to monitor your topiramate levels, especially if you’re taking this medication long-term or if you experience side effects like dizziness, fatigue, or changes in vision. It helps ensure the drug is working effectively and at a safe level in your body.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re on topiramate, your doctor may ask you to stop taking it temporarily before the test for accuracy.

What the Results Mean

Results are compared to a general reference range for topiramate in blood. If levels are too high or too low, it may indicate issues like poor absorption, drug interactions, or non-compliance with your medication.

Possible Side Effects of Topiramate

Topiramate can cause side effects like dizziness, weight loss, or difficulty concentrating. If you notice unusual symptoms, discuss them with your doctor before retesting.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal levels of topiramate can affect its effectiveness. High levels may require dose adjustments or temporary discontinuation, while low levels could mean the medication isn’t working as intended. This test helps prevent toxicity or insufficient treatment.

Short name

Topiramate Level

Frequently asked questions

How often should I get this test?
Your doctor will determine the frequency based on your condition, medication regimen, and response to treatment. Typically, it’s done every few months or as needed for monitoring.
What if my test results are outside the normal range?
If your topiramate levels are too high, your doctor may adjust your dose, recommend a different medication, or temporarily stop topiramate. If levels are too low, they may increase your dose or check for possible drug interactions.
Can I eat or drink before this test?
You can eat and drink normally unless instructed otherwise. Some tests may require fasting, but this test does not.
  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