Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.
Seizure Medicine Levels in Blood Test
A medicine blood level test measures how much of your medicine is in your blood. Your doctor checks it to make sure that you are taking a safe and effective dose. This testing is also called therapeutic drug monitoring.
Why It Is Done
Seizure medicines are usually monitored because:
- At a low blood level, they don't control seizures as well as they should.
- At a high blood level, they may cause problems.
Your doctor may use your test results to adjust your dose.
You may need testing when you take a seizure medicine such as:
- Valproic acid.
When these medicines are used to treat bipolar disorder, nerve pain, or migraine headaches, testing for low levels isn't as common as for seizures.
How To Prepare
Depending on which medicine you take, your doctor may schedule your test at a certain time of day. For example, your test may be done right before you take a dose of medicine.
How It Is Done
A health professional uses a needle to take a blood sample, usually from the arm.
How It Feels
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
A medicine blood level test measures how much of your medicine is in your blood. Your doctor checks it to make sure that you're taking a safe and effective dose. This testing is also called therapeutic drug monitoring.
The medicine blood level is just a guide. Your doctor will also look at your results based on your age, health, and other factors to help decide whether you are taking the right amount of medicine.
Current as of: June 17, 2021
Author: Healthwise Staff
Kathleen Romito MD - Family Medicine
Adam Husney MD - Family Medicine
Martin J. Gabica MD - Family Medicine
E. Gregory Thompson MD - Internal Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2021 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.