Predictive testing for Huntington’s disease was introduced in the late 1980s. It was offered reluctantly, however, because of the lack of treatment available for identified gene carriers and the potential for genetic discrimination—that is, the unfair and inappropriate treatment of a person or group on the basis of genetic information. In the linked cross sectional survey (doi:10.1136/bmj.b2175), Bombard and colleagues assess the nature and prevalence of genetic discrimination in a cohort of asymptomatic genetically tested and untested people at risk for Huntington’s disease.