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Lamotrigine Blood Level: What Your Test Results Mean

The lamotrigine test monitors blood levels of this anticonvulsant and mood stabilizer, as prescribed by your doctor. As part of comprehensive health monitoring, this test helps ensure your medication levels remain within the therapeutic range.

Doctor's Assessment Included

When is this value abnormal?

Decision limits per result, in mg/l
Result Value (mg/l)
Subtherapeutic < 2,5
Therapeutic 2,5–15
Above therapeutic range ≥ 15

Dalspiegel. Bereik voor epilepsie; bij bipolaire stoornis 5–11 mg/l. Toxisch: > 20 mg/l.

Source: UMC Utrecht

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

This test measures the blood concentration of the medication lamotrigine, as prescribed by your doctor. Monitoring helps your healthcare provider determine whether your current dose is producing levels within the desired therapeutic range.

Why It Matters

Maintaining lamotrigine within the therapeutic range is important for effective seizure control or mood stabilization. Levels that are too low may not provide adequate benefit, while levels that are too high may be associated with an increased risk of side effects.

When to Test

Testing is typically recommended when starting or adjusting lamotrigine therapy, when adding or removing interacting medications, or if your doctor suspects subtherapeutic or toxic levels. Regular monitoring as advised by your healthcare provider is essential.

Symptoms

Low Levels

Low lamotrigine levels may indicate subtherapeutic dosing, which can be associated with breakthrough seizures or inadequate mood stabilization. Consult your healthcare professional if you experience a return of symptoms.

High Levels

High lamotrigine levels may indicate a risk of toxicity, which can be associated with skin rash, dizziness, blurred vision, nausea, and coordination difficulties. Contact your healthcare provider promptly if you experience these symptoms.

Lifestyle Tips

Take lamotrigine exactly as prescribed by your doctor and do not adjust your dose without medical guidance. Attend all scheduled blood monitoring appointments and inform your doctor of any new medications or supplements you are taking.

Frequently Asked Questions

How often should I have my lamotrigine levels checked?
Your doctor will determine the testing frequency based on your individual needs. Testing is often recommended after dose changes, when new medications are added, or at regular intervals during stable therapy.
Can other medications affect my lamotrigine levels?
Yes, several medications can influence lamotrigine levels, including certain oral contraceptives and other anticonvulsants. Always inform your healthcare provider about all medications and supplements you take.
Should I take my medication before the blood test?
Your doctor will advise you on timing. Trough levels are often measured just before your next dose. Follow the specific instructions provided by your healthcare professional.

Tests with related values

These panels measure values from the same category as this marker.

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