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The “Interleukin-6 (IL-6)” test measures the level of IL-6, a cytokine involved in immune response and inflammation, in the blood. Elevated IL-6 levels can indicate acute or chronic inflammation and are associated with conditions such as infections, autoimmune diseases, and certain cancers. This test is also sometimes used to monitor inflammatory activity in diseases like rheumatoid arthritis and COVID-19, as high IL-6 levels can be a marker of severe inflammation.