Pregnant women who develop marked increased blood sugar levels during pregnancy can reduce the risk of certain birth complications if they receive treatment. This is a prerequisite for offering all pregnant women routine screening for gestational diabetes. However, potential disadvantages of this type of routine screening have not been thoroughly researched. This is the conclusion of the Institute for Quality and Efficiency in Health Care (IQWiG) in its final report published on 3 September 2009 and for which an English-language summary is now available.