Objectives: The aim was to summarize national prevention of mother-to-child transmission (PMTCT) guidelines across Europe and to identify differences between these. Methods: A survey was conducted using a structured questionnaire sent to experts in 25 European countries from January to March 2012, requesting a copy of the national guidelines. Responses were received from 23 countries. Results: Twenty-two (96%) countries supported a policy to recommend antenatal HIV screening for all pregnant women (15: opt-out strategy; 8: opt-in strategy). For HIV-positive women in whom the only indication for antiretroviral therapy (ART) was PMTCT, the recommended gestational age for commencing ART varied from 12 to 28 weeks: initiation before 19 weeks gestation was recommended in guidelines from nine countries; in France, the UK and the Netherlands, there was a wide range, from 14 to 24 weeks, whereas the Swiss and Ukrainian guidelines recommended starting at 24-28 weeks and the German/Austrian and Lithuanian at 28 weeks. Six national guidelines recommended inclusion of Zidovudine in antenatal ART regimens, and seven (37%) allowed continuation of Efavirenz for women conceiving on this drug. According to nine guidelines, zidovudine should always be used intrapartum. Eighteen national guidelines stated that HIV-positive women on successful ART can have a vaginal delivery. Viral load thresholds for vaginal delivery were <1000 copies/ml in 5 countries, <400 copies/ml in 3 and <50 copies/ml in 11 countries. Conclusion: There are important differences across Europe in national PMTCT guidelines, with most variation seen where the evidence-base remains limited. Such differences should be considered when interpreting research and surveillance finding
