Immediate Diagnostics™ | A Division of ASE Center for Clinical Diagnostics & Research Providing Urgent Care Lab Services with Quality Results and Fast Turnaround Times! We are an Immediate Care / Urgent Care Laboratory, providing on-demand service to patients across the Greater Chicago, Central Illinois, & Northwest Indiana Regions. Immediate Diagnostics™ also provides mobile specimen collection! Due to the versatility of our services we are capable accommodating both, urban and rural communities. When Quest Diagnostics and Lab Corp are Closed, We are open to provide you with fast and convenient labs.