ACL Laboratories (often referred to as ACL Labs) is a major clinical and pathology testing network operating extensively throughout Illinois and Wisconsin, and it is closely affiliated with Advocate Aurora Health. While the network features numerous patient service centers and regional facilities across Northern Illinois and the greater Chicago metropolitan area, its centralized testing operations serve hospitals and clinics throughout the broader Midwest region. It is a distinct healthcare-linked laboratory organization rather than an exclusive standalone facility named solely after the city of Aurora, though it services patients in that geographic area.