This test is performed when a patient on carbamazepine presents with symptoms of its toxicity, which includes
Long term use of carbamazepine causes hepatitis, bone marrow depression (low WBC count, low hemoglobin), kidney failure, dermatitis (skin problems) etc.
The test is negative if levels are < 12 mg/L. It means the dosage of carbamazepine is appropriate for the patient.
The test is positive if levels are > 12 mg/L and this means one of the following-
Toxicity or Critical levels are > 40 mg/L. This means either