The Autoimmune Disease Diagnosis Market is expected to grow from USD 4.1 billion in 2020 to USD 8.3 billion by 2030, at a CAGR of 8.9%. Autoimmune diseases occur when the immune system mistakenly attacks healthy body cells, mistaking them for foreign invaders. This can lead to the production of autoantibodies that target organs or tissues, with some conditions, like Type 1 diabetes, affecting specific organs, while others, like systemic lupus erythematosus (SLE), impact the entire body. The market's growth is driven by the rising prevalence of autoimmune disorders, increasing awareness, and advancements in autoimmune disease research.