COVID – 19 Update AVISE SLE Monitor Exagen Inc. Patient Focused. Discovery Driven. Exagen Inc. is a patient-focused and discovery-driven commercial-stage life sciences company. We aid patients and healthcare providers in the diagnosis, prognosis, and management of autoimmune conditions. Our relentless pursuit for laboratory excellence has enabled us to develop next-generation autoimmune testing to help empower physicians and improve patients' lives. About Exagen We are an innovative life sciences company, offering physicians advanced testing to help address the significant unmet need for accurate and timely diagnosis, prognosis and monitoring of autoimmune conditions. Learn More Our Products AVISE testing offers next-generation insight to aid the diagnosis, prognosis and monitoring of autoimmune conditions. Learn More Press Releases Please checkout our upcoming latest press releases. Learn More Proud Exagen Partners ©2021 Exagen Inc. | All Rights Reserved SA1168

About Exagen Inc. Exagen is dedicated to transforming the care continuum for patients suffering from debilitating chronic autoimmune diseases. Our portfolio of innovative products enable timely differential diagnosis, prognosis, management, and optimization of therapeutic intervention. Our Products At Exagen, we continue translating our discovery and development into real solutions that are safe, reliable and cost effective. Our current AVISE® product line encompasses four game-changing products: AVISE® CTD Our comprehensive diagnostic tool that is powered by scientifically proven CB-CAPs technology and designed specifically to help distinguish patients that have CTD or similar diseases with overlapping symptoms. AVISE® SLE Prognostic Developed as an add-on test to AVISE® CTD, AVISE® Prognostic helps assess a patient’s potential risk for organ involvement through Thrombosis, Cardiovascular events, Lupus Nephritis and Neuropsychiatric Lupus. AVISE® SLE Monitor AVISE® SLE Monitor is a unique laboratory monitoring tool leveraging the power of Erythrocyte-Bound C4d (EC4d) to help assess patients with SLE. View All Products Our Mission Exagen is committed to providing physicians with products that address the significant unmet need for accurate and timely diagnosis, prognosis and monitoring of ARD/CTD so they, in turn, can help more patients in need. We will continue translating our discovery and development into real solutions that are safe, reliable and cost effective. ©2021 Exagen Inc. | All Rights Reserved SA1168