Lamotrigine blood level
Quick answer: This test measures the amount of lamotrigine, a medicine for epilepsy and bipolar disorder, in your blood. It helps doctors check the dose, especially when other medicines are added or during pregnancy.
- 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 careLamotrigine levels often fall during pregnancy, so doctors may check them more often in women who are pregnant or planning pregnancy.
How the test is done
- 1You keep to your normal dose schedule before the test
- 2The sample is usually taken in the morning before your dose
- 3You tell the staff about other epilepsy medicines and hormonal contraception
- 4The lab measures the lamotrigine level 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 after dose increases or with valproate, and can cause dizziness, double vision or unsteadiness. A low level can be seen with missed doses, pregnancy or some contraceptive pills.
Who usually has this test
People on lamotrigine, especially women who are pregnant, planning pregnancy, or starting or stopping hormonal contraception.
Risks and aftercare
Bruising is possible; keep taking your medicine as prescribed.
Names and options
Also called: Lamictal level, lamotrigine test
Listed by the hospital as
- LAMOTRIGINE LEVEL, SERUM
Questions about this test
Why do lamotrigine levels fall in pregnancy?
The body clears lamotrigine faster in pregnancy, so levels can drop. Doctors often check levels more often and adjust doses, so do not change your dose on your own.
Can the contraceptive pill affect lamotrigine?
Yes, pills containing oestrogen can lower lamotrigine levels. Tell your doctor before starting or stopping them.
What should I do if I get a rash on lamotrigine?
A rash can rarely be a sign of a serious reaction, especially early in treatment. Contact your doctor straight away.
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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.