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Carbamazepine in Serum (Mass Concentration)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of carbamazepine, a medication used to treat certain types of seizures or nerve pain, in your blood.

Quick summary

["Helps monitor your dose to avoid side effects or drug resistance."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
9697-4
Short code
Deprecated carBAMazepine EP SerPl-mCnc
Synonyms
Deprecated carBAMazepine EP SerPl-mCnc
Category
chemistry
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
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 healthcare provider may order this test if you’re taking carbamazepine to manage epilepsy or another condition. It helps ensure the right amount of medication is in your bloodstream to control symptoms while minimizing risks.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a small needle inserted into your arm to draw blood. If you’re on blood thinners or have a history of bleeding, let your provider know.

What the Test Results Mean

Results show how much carbamazepine is in your blood at the time of testing. They help adjust your dose if needed, especially if you experience side effects like dizziness, drowsiness, or unusual tiredness.

Common Side Effects to Watch For

High or low levels can cause issues. Side effects of carbamazepine may include nausea, dizziness, or rash. If you notice these, discuss them with your doctor.

Reference range

Therapeutic: 4-12 mcg/mLN/A

Specimen: serum

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: Monitoring Drug Levels

Short name

Carbamazepine Level

Frequently asked questions

How Often Should I Get This Test?
Your provider will determine your testing schedule based on your treatment plan, symptoms, and how your body responds to the medication. Follow their instructions closely.
Can I Eat or Drink Before the Test?
You can eat and drink normally unless instructed otherwise. Blood tests don’t require fasting unless specified for other reasons.
What If My Results Are Outside the Expected Range?
If results are abnormal, your doctor will review them with you. They may adjust your dose, check for interactions with other medications, or investigate other health factors affecting your levels.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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