Exagen Inc. is a commercial-stage life sciences company. The Company offers physicians testing for patients and healthcare providers in diagnosis, prognosis and monitoring of autoimmune conditions. Its diagnostic tests include AVISE connective tissue disease (CTD), AVISE Lupus and AVISE antiphospholipid syndrome (APS). Its prognostic tests include AVISE systemic lupus erythematosus (SLE) Prognostic, AVISE Platelet-bound C4d (PC4d) and AVISE Anti- carbamylated proteins (CarP). Its monitoring tests include AVISE SLE Monitor, AVISE methotrexate (MTX) and AVISE hydroxychloroquine (HCQ).