Skip to content

Topiramate concentration in plasma (quantitative)

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

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

Quick summary

["Knowing your topiramate levels helps doctors monitor your dose and adjust it as needed for safety and effectiveness."]

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

Key facts at a glance

LOINC
73111-7
Short code
Topiramate ind plt IgG SerPl Ql FC
Synonyms
Topiramate 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

Why This Test Is Done

Your doctor may order this test if you’re taking topiramate to check if your dose is working properly. It helps ensure you’re getting the right amount of medication and to avoid side effects.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. The process usually takes a few minutes.

What the Results Mean

Results show the concentration of topiramate in your blood plasma. While reference ranges vary by lab, your doctor will compare your result to your specific dose and medical needs.

Possible Side Effects

Topiramate can cause side effects like dizziness, fatigue, or changes in mood. High or low levels may also affect how well the drug works or increase risks.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Topiramate Level

Frequently asked questions

Topiramate levels help prevent overdose or insufficient dosing, which could lead to seizures, kidney issues, or reduced effectiveness of the medication.
This test is most useful for patients on long-term topiramate therapy, especially those with epilepsy or migraine disorders.
How often should I get this test?
Your doctor will determine the timing based on your treatment plan. Typically, it’s done periodically (e.g., every few months) to adjust your dose if needed.
What happens if my levels are too high or too low?
If levels are too high, your doctor may reduce your dose to avoid side effects. If levels are too low, they may increase it to improve treatment effectiveness.
  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