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Lamotrigine Serum Concentration (Mass Concentration)

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

This test measures the amount of lamotrigine, a medication used to treat certain seizures and mood disorders, in your blood.

Quick summary

["Your doctor may check this level to ensure the medication is working properly and to avoid potential side effects."]

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

Key facts at a glance

LOINC
41761-8
Short code
lamoTRIgine SerPl Scn-mCnc
Synonyms
lamoTRIgine SerPl Scn-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
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 healthcare provider may order this test if you’re taking lamotrigine to monitor your dose. It helps ensure the medication is at an effective level without causing too much in your system.

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 blood. It usually takes a few minutes.

What the Test Results Mean

Results help doctors adjust your dose if needed. Too little may mean the medication isn’t working, while too much could increase side effects like rashes or dizziness.

Common Reasons for Monitoring

Doctors often check lamotrigine levels when starting the medication, after dose changes, or if you experience side effects like skin rashes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lamotrigine Level

Frequently asked questions

Why might my doctor want to check my lamotrigine level right away?
Your doctor may order this test if you’re experiencing unusual side effects, have missed doses, or if your symptoms aren’t improving as expected.
What do my results mean if they’re too high or too low?
Too high could mean you’re at risk for side effects like skin rashes or dizziness. Too low might mean your seizures or mood symptoms aren’t controlled. Always discuss results with your doctor.
Can I eat or drink before this test?
You can eat and drink normally unless your doctor specifies otherwise. No fasting is required for this blood test.
  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