Exagen Diagnostics is a commercial-stage diagnostics company committed to addressing the significant unmet need for the accurate diagnosis and monitoring of patients affected by autoimmune rheumatic diseases (ARDs). The company currently markets four products under its Avise brand to provide an accurate, timely and differential diagnosis and to optimize the treatment of ARDs. The company's lead product, Avise SLE+CT, is a proprietary diagnostic test that provides an enhanced solution for patients presenting with symptoms indicative of a wide variety of ARDs such as Systemic Lupus Erythematosus, Rheumatoid Arthritis, Sjögren's syndrome and scleroderma and other disorders that mimic ARDs such as fibromyalgia and autoimmune thyroid disease.