The AMR-ExC provides a robust extraction control for antimicrobial resistance detection workflows. It includes inactivated bacteria that carry a variety of clinically relevant resistance mechanisms, such as extended-spectrum ?-lactamases, carbapenemases, and efflux pump regulators. These organisms span multiple bacterial classes and resistance phenotypes, making AMRExC ideal for validating extraction protocols and ensuring reliable detection of resistance markers in multiplex PCR or sequencing-based panels.