Exagen Inc.
Biotechnology ResearchCalifornia, United States201-500 Employees
Exagen Inc. is a mid-sized biotechnology research company focused on autoimmune disease testing, aiming to clarify complex conditions for clinicians. Based in Vista, California, it offers a comprehensive rheumatology diagnostic platform that combines serology, cell-based assays, proprietary biomarkers, and a validated algorithm to support diagnosis and patient management. The company's lupus-related tests span diagnostic, prognostic, and disease-monitoring use, contributing to clinical confidence and earlier decision-making. Its customers include physicians, payers, and biopharmaceutical companies, with partnerships aimed at closing diagnostic gaps and enabling innovation in autoimmune care. Exagen emphasizes clinically validated biomarkers for SLE and RA, and has positioned itself as a leading provider within the autoimmune testing landscape. In 2025, it collaborated with Johns Hopkins University to highlight a urinary biomarker panel that could guide precision management of lupus nephritis.