The CCP antibody test helps to diagnose RA and can be useful in identifying people with a more rapidly erosive form of the disease. RA is a chronic, systemic autoimmune disease that causes inflammation, pain, stiffness, and destructive changes in the hands, feet, and other joints throughout the body.
As you can see from the map above, most of the Illinois population is based in the North East of the state. Chicago, home to 2,695,598 people, remains the largest city in Illinois. It dwarfs the state's other cities â the next largest is Aurora, with 197,899 people.
The Chicago-Naperville, IL-IN-WI Combined Statistical Area combines the metropolitan areas of Chicago, Michigan City (in Indiana), and Kankakee (in Illinois). This area represents the extent of the labor market pool for the entire region. The CSA has a population of 9,928,312 (2014 estimate).