A history of trans medicine that uses Scandinavian sources to tell a global story.  Standardizing Sex traces the emergence of trans medicine in Scandinavia in the twentieth century, exploring the construction and negotiation of medical expertise among medical professionals, patients, and activists in the media and government bureaucracy. The book combines the author’s analysis of medical records and other archival sources with oral history interviews with former patients, activists, doctors, psychologists, and civil servants. Physician-historian Ketil Slagstad uses the Scandinavian story of sex reassignment to anchor not only the role of the state but also bureaucracy and social rights. Scandinavian countries, he shows, played a foundational role in the emergence of trans medicine internationally. As a result, Standardizing Sex tells a transnational history of medicine that sheds light on a set of relations and problems that continue to impact discussions of trans medicine and trans rights around the world.   Slagstad’s sources offer a rare opportunity to explore the emergence of trans medicine in action in the clinic, laboratory, waiting room, and operating room, as well as in the bureaucrat’s office, on the psychologist’s couch, and in the publications and meetings of activist groups. Together, these sources allow for the analysis of the increasingly complex negotiations of nosological criteria, medical knowledge, and medical practices in a formative period for transgender medicine. More generally, the book offers a story about the reshaping of the normal and the pathological in modern societies.