Theradiag SA is engaged in the provision of diagnostic services for autoimmune diseases. It operates through the Theranostics and Diagnostics business segments. The Theranostics segment offers solutions for patients treated with anti-tumour necrosis factor alpha. The Diagnostics segment includes products for anti-immunity, genetics, allergy, infectious disease, drug of abuse, other diagnoses, and instrumentation. The company was founded on December 29, 1986 and is headquartered in Croissy-Beaubourg, France.