Autoimmune diseases occur when the immune system mistakenly attacks the body's own tissues. There are over 80 recognized autoimmune conditions, including rheumatoid arthritis, lupus, celiac disease, and Hashimoto's thyroiditis. Lab tests play a crucial role in diagnosing and monitoring these conditions.
Autoimmune diseases are characterized by the presence of autoantibodies—antibodies that attack the body's own cells and tissues. Specific autoantibody tests help identify particular autoimmune conditions. For example, anti-tissue transglutaminase (anti-tTG) antibodies indicate celiac disease, while rheumatoid factor and anti-CCP antibodies are associated with rheumatoid arthritis.
Inflammation markers like CRP and ESR are typically elevated in active autoimmune disease. These markers help assess disease activity and response to treatment. Additionally, complete blood counts may show anemia or low white blood cell counts, which can occur in certain autoimmune conditions.
Thyroid function tests are particularly important, as autoimmune thyroid disease (Hashimoto's thyroiditis and Graves' disease) is among the most common autoimmune conditions. TSH, free T4, and thyroid antibodies help diagnose and monitor thyroid autoimmunity.
Liver and kidney function tests are important in autoimmune disease monitoring, as some conditions can affect these organs. Additionally, certain medications used to treat autoimmune diseases require regular lab monitoring to assess for side effects.
Early diagnosis and treatment of autoimmune diseases can prevent serious complications and improve quality of life. If you suspect you have an autoimmune condition, work with your healthcare provider to obtain appropriate testing and evaluation.