Today, our employees are located at our three major campuses in Phoenix/Scottsdale, Arizona, Jacksonville, Florida, Rochester, Minnesota, and at Mayo Clinic Health System campuses throughout Midwestern communities, and at our international locations. License or Certifications: State of Florida Clinical Technologist license in the areas of chemistry, hematology, microbiology, serology, immunohematology, or histocompatibility, or as specified by the lab.