In France, an estimated 15,000 to 30,000 people are believed to be living with HIV but undiagnosed, and half of all HIV diagnoses are made at an advanced stage, when CD4 counts are below 350 cells/mm³. This article presents data on HIV testing activity in France from 2003 to 2011, based on the LaboVIH survey. In 2011, 5.2 million (95% CI: [5.12–5.24]) HIV serology tests were performed in France, representing a significant increase of 4% compared to 2010. The number of tests increased in the overseas departments (DOM) and in mainland France, excluding Île-de-France, while it remained stable in Île-de-France. Approximately 10,517 (95% CI: [10,276–10,758]) serology tests were confirmed positive in 2011, a number that has remained stable since 2007 at the national level. The number of positive serology tests has been increasing since 2007 in mainland France excluding Île-de-France, while it has been decreasing in Île-de-France and the DOMs. In 2011, 7% of HIV serology tests were conducted anonymously and free of charge, and the proportion of positive results was higher among anonymous tests than among non-anonymous tests (3.2 versus 1.9 per 1,000 tests). These data show that, in the year following the publication of recommendations to expand screening, the number of serological tests performed increased, without a corresponding increase in the number of positive results. A longer-term perspective is needed to determine whether this expansion enables earlier diagnosis and a reduction in the prevalence of people infected with HIV but undiagnosed. (R.A.)