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Carbamazepine

Carbamazepine monitoring is an important part of managing your prescribed anticonvulsant therapy. Regular blood level checks support your healthcare team in maintaining effective and safe treatment.

Doctor's Assessment Included

When is this value abnormal?

Decision limits per result, in mg/l
Result Value (mg/l)
Subtherapeutic < 4
Therapeutic 4–12
Above therapeutic range ≥ 12

Dalspiegel. Bereik voor epilepsie; als stemmingsstabilisator 4–10 mg/l (onderhoud) tot 8–12 mg/l (acute fase). Toxisch: > 12 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 concentration of carbamazepine in your blood. It helps verify that the dose prescribed by your doctor achieves therapeutic levels, supporting effective seizure control or symptom management while reducing the risk of toxicity.

Why It Matters

Carbamazepine has a well-defined therapeutic range. Levels that fall below this range may not adequately control symptoms, while elevated levels can be associated with side effects such as dizziness, double vision, and unsteadiness. Additionally, carbamazepine can induce its own metabolism over time, potentially requiring dose adjustments.

When to Test

Your doctor may request this test when starting carbamazepine, after dose changes, when other medications are added or changed, if breakthrough seizures occur, or if side effects are suspected. Regular monitoring is often recommended during the first months of treatment and periodically thereafter.

Symptoms

Low Levels

Levels below the therapeutic range may indicate subtherapeutic dosing, which can be associated with inadequate symptom control, such as breakthrough seizures or return of pain. Consult a healthcare professional for interpretation of results.

High Levels

Levels above the therapeutic range may indicate a risk of toxicity. Symptoms can include dizziness, double vision, unsteadiness, nausea, and in severe cases, cardiac conduction disturbances. Contact your doctor promptly if you experience these symptoms. Consult a healthcare professional for interpretation of results.

Lifestyle Tips

Take carbamazepine exactly as prescribed by your doctor. Avoid grapefruit juice, as it can affect drug metabolism. Inform your doctor of all other medications and supplements, as many substances interact with carbamazepine. Do not adjust your dose without medical guidance.

Frequently Asked Questions

Why do carbamazepine levels need regular monitoring?
Carbamazepine can induce its own metabolism, meaning your body may break it down faster over time. Regular monitoring helps your doctor ensure levels remain within the therapeutic range and adjust the dose if needed.
Can I take other medications with carbamazepine?
Carbamazepine interacts with many medications, including other anticonvulsants, oral contraceptives, and certain antibiotics. Always discuss any new medications or supplements with your doctor before starting them.
What should I do if I miss a dose?
If you miss a dose, take it as soon as you remember unless it is almost time for your next dose. Never take a double dose to make up for a missed one. Consult your doctor or pharmacist if you are unsure.

Tests with related values

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

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SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Omega-3 Index Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count
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Carbamazepine

€49,-