Editing Ectopic pregnancy (section)

== Epidemiology ==

[[File:Tubal Pregnancy with embryo.jpg|thumb|An opened oviduct with an ectopic pregnancy at about seven weeks' gestational age<ref>{{Cite journal |last=Uthman |first=Ed |name-list-style=vanc |date=2014 |title=Tubal pregnancy with embryo |journal=WikiJournal of Medicine |volume=1 |issue=2 |doi=10.15347/wjm/2014.007 |doi-access=free}}</ref>]]

The rate of ectopic pregnancy is about 1% and 2% of live births in developed countries, though it is as high as 4% in pregnancies involving assisted reproductive technology.<ref name=kirk2013/> Between 93% and 97% of ectopic pregnancies are located in a fallopian tube.<ref name=Crochet2013/> Of these, in turn, 13% are located in the [[isthmus of uterine tube|isthmus]], 75% are located in the [[Ampulla of uterine tube|ampulla]], and 12% in the [[Fimbriae of uterine tube|fimbriae]].<ref name=kirk2013/> Ectopic pregnancy is responsible for 6% of maternal deaths during the first trimester of pregnancy making it the leading cause of maternal death during this stage of pregnancy.<ref name=Crochet2013/>

Between 5% and 42% of women seen for ultrasound assessment with a positive pregnancy test have a pregnancy of unknown location, that is a positive pregnancy test but no pregnancy visualized at transvaginal ultrasonography.<ref name=kirk2013/> Between 6% and 20% of pregnancy of unknown location are subsequently diagnosed with actual ectopic pregnancy.<ref name=kirk2013/>