The safety of UK couples who travel abroad for in vitro fertilisation (IVF) treatment is being jeopardised by the lack of uniform clinical and safety regulations, say fertility organisations. Women are at greater risk of multiple births, which increases the danger of medical complications to mother and baby, says a new report by the European Society of Human Reproduction and Embryology and the International Federation of Fertility Societies. A survey of more than 100 countries looking at the rules and regulations relating to assisted conception, particularly IVF, found that some countries have high numbers of multiple pregnancy because of the number of embryos they transfer during assisted conception.