The Clozapine test measures the concentration of clozapine, an antipsychotic medication, in the bloodstream to ensure therapeutic efficacy and prevent toxicity. Monitoring clozapine levels is crucial for managing treatment-resistant schizophrenia, as it helps maintain safe and effective drug levels. This test is typically ordered when symptoms persist, side effects appear, or dosage adjustments are necessary. Regular testing aids in achieving optimal dosage and minimizing adverse effects, contributing to a safer and more effective treatment plan.