Biotest AG engages in the development and distribution of biological and biotechnological pharmaceutical products. It focuses in the field of clinical immunology, haematology, and intensive care medicine. The company operates through the following segment: Therapy, Plasma & Services, and Other. The Therapy segment provides products and development projects assigned to each of the three indication areas. The Plasma & Service segment is the combination of plasma sales and toll manufacturing. The Other segment refers to the merchandise business. Biotest was founded by Carl Adolf Schleussner and Hans Schleussner in 1946 and is headquartered in Dreieich, Germany.