Dangerous Diagnostics is a powerful study of the pervasiveness of diagnostic testing and the potential it offers institutions to classify, categorize, and ultimately control individuals. Nelkin and Tancredi explore the ethical, social, and legal implications of cutting-edge technologies that can lead to new forms of discrimination in the name of standardized, objective measurements. They caution against the creation of an underclass deemed unemployable, untrainable, or uninsurable by such diagnostic tests.