Carbamazepine blood level
Quick answer: This test measures the amount of carbamazepine, a medicine for epilepsy and some nerve pain and mood conditions, in your blood. It helps doctors check the dose is in a useful range, and look into side effects or missed doses.
- SampleBlood
- TakesAbout 5 minutes
- Before the testYour doctor will tell you when to give the sample; it is often taken just before your next dose.
- In fertility careIf you take this medicine and are planning a pregnancy, talk to your doctor before trying, as it can affect pregnancy planning.
How the test is done
- 1You take your medicine as usual unless told otherwise
- 2Blood is usually drawn just before your next dose (a trough level)
- 3You tell the staff when you took your last dose
- 4The lab measures the amount of carbamazepine in your blood
What your results can mean
Reading your report
Results are read with your dose and symptoms; do not change your dose without talking to your doctor.
If the result is outside the usual range
A high level can be seen with too high a dose or with interacting medicines, and can cause dizziness, double vision or unsteadiness. A low level can be seen with missed doses or with medicines that speed up its breakdown.
Who usually has this test
People taking carbamazepine, especially after a dose change, a new medicine or new side effects.
Risks and aftercare
Bruising is possible; continue your medicine as prescribed.
Names and options
Also called: Tegretol level, carbamazepine test
Listed by the hospital as
- CARBAMAZEPINE, SERUM
Questions about this test
Why is the blood taken before my next dose?
Levels go up and down through the day. A sample just before the next dose gives a steady reading that is easy to compare over time.
Can carbamazepine affect pregnancy plans?
Carbamazepine can carry some risk to a developing baby, and its levels can change in pregnancy. Talk to your neurologist before trying to conceive, and do not stop the medicine on your own.
Why is a blood count checked with carbamazepine?
Rarely, carbamazepine can lower blood cell counts or affect the liver or salt levels. Doctors may check these along with the drug level.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.