Which metrics are typically used in noncompartmental analysis?

• A. Vd and CL
• B. AUC, Cmax, Tmax
• C. t1/2 and CL
• D. Bioavailability and protein binding

Answer: (B)

Noncompartmental analysis uses concentration-time data without fitting to a specific compartment model. The metrics reported are derived directly from the curve: AUC, Cmax, and Tmax. AUC (area under the curve) captures total drug exposure over time. Cmax is the highest observed concentration, reflecting peak exposure and the balance of absorption and elimination. Tmax is the time to reach that peak, indicating how quickly the drug reaches systemic circulation. These measures require no assumptions about how the body is organized into compartments, which is the hallmark of noncompartmental analysis. While parameters like t1/2 and CL can be calculated from the curve under certain conditions, they rely on additional steps or assumptions and are not the primary descriptors used in noncompartmental reporting.