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Carbamazepine Blood Test

Last updated July 24, 2019

Approved by: Maulik P. Purohit MD MPH

A Carbamazepine Blood Test is a test to assess the levels of carbamazepine in blood. It is used when adjusting the initial dose and to ensure that carbamazepine levels stay within an acceptable range.


What are the other Names for this Test? (Equivalent Terms)

  • CBZ Levels Blood Test
  • Epitrol® Levels Blood Test
  • Tegretol® Levels Blood Test

What is Carbamazepine Blood Test? (Background Information)

  • Carbamazepine is an anticonvulsant drug used to treat seizures. It is also used to treat bipolar disorder and other psychiatric conditions. Carbamazepine is also known under the brand names Carbategretal®, Carbazep®, Epitrol®, and Tegretol®
  • Seizures are episodes of abnormal and excessive brain cell activity; they may last several seconds to even 5 minutes. Often, the cause of a seizure is unknown. A seizure may occur as result of a nervous system disorder, called epilepsy. They may also occur following a brain surgery
  • During a seizure, an individual may convulse or display other uncontrolled physical behaviors. Such seizures are said to be convulsive and convulsive seizures are the most common seizures
  • Alternatively, non-convulsive seizures do not exhibit this uncontrolled physical behavior. Instead, an individual experiencing this seizure type may momentarily lapse out of consciousness, effectively “zoning out”
  • Brain cells communicate to each other and to other cells, through electrical signals. During a seizure, brain cells are rendered excessively conductive. The brain cells that are over-conductive transfer electrical signals too freely. This results in the derailment of their communications system, causing either convulsive or non-convulsive effects of seizures
  • The drug carbamazepine dampens the activities of brain cells. It works by reducing the sky-high conductivity of brain cells to more functional levels. This is also how the carbamazepine drug works to treat bipolar disorder and other psychiatric conditions
  • Like every other drug, carbamazepine must be kept within a certain range, in order to prevent certain unwanted effects. If levels are too high, it may result in toxicity. If the levels are too low, the drug may not successfully ward-off a seizure attack
  • A Carbamazepine Blood Test is a test to assess the levels of carbamazepine in blood. It is used when adjusting the initial dose and to ensure that carbamazepine levels stay within an acceptable range

What are the Clinical Indications for performing the Carbamazepine Blood Test?

Following are the clinical indications for performing a Carbamazepine Blood Test:

  • To determine the initial dosage requirement in an individual with seizure, by measuring the levels of carbamazepine in blood
  • To monitor carbamazepine therapy; to ensure that the anticonvulsant drug is within acceptable levels

How is the Specimen Collected for Carbamazepine Blood Test?

Following is the specimen collection process for Carbamazepine Blood Test:

Sample required: Blood

Process: Insertion of a needle into an arm vein.

Preparation required: No special preparation is needed prior to the test.

What is the Significance of the Carbamazepine Blood Test Result?

The significance of the Carbamazepine Blood Test is explained:

  • Excessive carbamazepine levels may indicate carbamazepine toxicity, marked by:
    • Respiratory depression
    • Stupor
    • Coma
  • Low carbamazepine levels may indicate that more carbamazepine is necessary to achieve a therapeutic dose

The laboratory test results are NOT to be interpreted as results of a "stand-alone" test. The test results have to be interpreted after correlating with suitable clinical findings and additional supplemental tests/information. Your healthcare providers will explain the meaning of your tests results, based on the overall clinical scenario.

Additional and Relevant Useful Information:

  • Carbamazepine is a known teratogen, which means that it may cause birth defects and other abnormalities. Extreme caution is advised, while administering carbamazepine drug during pregnancy

Certain medications that you may be currently taking may influence the outcome of the test. Hence, it is important to inform your healthcare provider, the complete list of medications (including any herbal supplements) you are currently taking. This will help the healthcare provider interpret your test results more accurately and avoid unnecessary chances of a misdiagnosis.

References and Information Sources used for the Article:


Reviewed and Approved by a member of the DoveMed Editorial Board
First uploaded: June 12, 2014
Last updated: July 24, 2019