How are CBC and ESR results interpreted together in diagnosing autoimmune diseases?

When diagnosing autoimmune diseases, doctors often use CBC and ESR results together. A CBC measures components like white blood cells and hemoglobin, which can reveal anemia or immune system activity. A high ESR indicates inflammation. Together, these tests help doctors assess conditions like rheumatoid arthritis, lupus, and vasculitis. For example, an elevated ESR combined with low hemoglobin and abnormal white blood cell counts could indicate active inflammation due to an autoimmune disease, prompting further specialized testing.