Carbamazepine concentration in plasma (quantitative measurement)
This test measures the amount of carbamazepine, a medication used to treat certain types of seizures and nerve pain, in your blood plasma. It helps doctors monitor your drug levels to ensure they’re effective and safe.
["This test helps adjust your carbamazepine dose to avoid side effects or insufficient treatment."]
Key facts at a glance
- LOINC
- 73486-3
- Short code
- carBAMazepine ind plt IgG SerPl Ql FC
- Synonyms
- carBAMazepine ind plt IgG SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 4
- Ref high
- 12
- Critical range
- — – 15 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test if you’re taking carbamazepine to manage epilepsy, bipolar disorder, or other conditions. It’s often done regularly to check if your blood levels are within the recommended range for your condition.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm or hand to draw blood. If you’re on blood thinners or have a history of bleeding issues, let your doctor know beforehand.
What the Test Results Mean
Results are typically reported in micrograms per milliliter (µg/mL). Low levels may mean the drug isn’t working well, while high levels could indicate side effects like dizziness, drowsiness, or rash. Your doctor will interpret results based on your medical history and symptoms.
Possible Side Effects of Carbamazepine
Carbamazepine can cause side effects like dizziness, nausea, or fatigue. Rarely, it may lead to serious issues like bone marrow suppression or skin reactions. If you experience severe symptoms like chest pain, irregular heartbeat, or skin rash, seek medical attention immediately.
Reference range
Therapeutic: 4-12 mcg/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Carbamazepine Level (Plasma)
Frequently asked questions
What does a carbamazepine level tell your doctor?
How often should I get this test?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy