Carbamazepine µmol/L → µg/mL
Convert carbamazepine from µmol/L to µg/mL
Sources last checked: 2026-11-03
Carbamazepine µmol/L → µg/mL
Convert carbamazepine from µmol/L to µg/mL
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Carbamazepine µmol/L → µg/mL?
This converter turns a carbamazepine concentration from µmol/L, used by some SI-reporting laboratories and in parts of the literature, into µg/mL (identical to mg/L), the unit most laboratories and dosing references use. It divides by 4.232 (equivalent to multiplying by about 0.2363), derived from the molar mass of carbamazepine, 236.27 g/mol.
When to use it
- Reading a carbamazepine level in µmol/L from an SI-reporting letter or study
- Comparing serial levels from laboratories that report in different units
- Using pharmacokinetic references written in mg/L
When not to use it
- Carbamazepine-10,11-epoxide or oxcarbazepine metabolite results, which need their own molar masses
- Interpreting the value: target ranges depend on the laboratory, the indication and the clinical response
How it is calculated
Carbamazepine (µg/mL) = carbamazepine (µmol/L) ÷ 4.232
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- Dividing by 4.232 is the same as multiplying by 0.2363; dividing by 4 gives a quick estimate that slightly overestimates.
- µg/mL and mg/L are numerically identical, so a result in mg/L can be compared directly.
- A level taken in the first weeks of therapy may fall later as autoinduction develops; repeat monitoring after the dose has been stable for some time is common practice.
- Symptoms such as diplopia, ataxia or dizziness can occur with a level that looks unremarkable, particularly when the epoxide metabolite is high.
Frequently asked questions
How do I convert carbamazepine from µmol/L to µg/mL?
Divide by 4.232. For example, 26 µmol/L ÷ 4.232 = 6.1 µg/mL.
Is µg/mL the same as mg/L for carbamazepine?
Yes. 1 µg/mL = 1 mg/L exactly.
When should a carbamazepine level be taken?
For routine monitoring, at steady state and usually as a trough before the next dose. Because of autoinduction, a level soon after starting therapy may not represent the later steady state.
Evidence and guidelines
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<p><a href="https://medelix.ai/en/calculators/carbamazepine-umol-l-to-ug-ml">Carbamazepine µmol/L → µg/mL calculator by Medelix</a></p>For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.