Bulk OEM Reagents (Reagent 1/ Reagent 2) for automated chemistry analyzers. Carbamazepine is an anticonvulsant which is structurally related to tricyclic antidepressants and is useful in treating patients with temporal lobe epilepsy, bipolar disorder, and trigeminal neuralgia. Carbamazepine often requires therapeutic drug monitoring by determining its concentration in serum or plasma. A narrow therapeutic index necessitates an accurate and reliable means for the measurement of carbamazepine concentration in human serum or plasma. Due to the narrow therapeutic index, the increasing number of carbamazepine intoxications and the large number of potential patients worldwide; a high throughput detection method with high sensitivity and specificity is presented herein. Carbamazepine Assay provides a convenient and efficient method to monitor carbamazepine concentration in human serum.