n Obstetrics and Gynaecology Forum - Pregnancy of unknown location : review

Volume 20, Issue 2
  • ISSN : 1027-9148



A pregnancy of unknown location (PUL) is defined as visualising an empty uterus on transvaginal ultrasound scan (TVS), with no signs of an intrauterine pregnancy (IUP) or an ectopic pregnancy, in a woman with a positive pregnancy test. The majority of women will subsequently be diagnosed with spontaneously resolving pregnancies (failing PULs) or intra uterine pregnancies (IUPs) that were too early to visualise on TVS, but a few will be diagnosed with ectopic pregnancies that were too early to visualise or were missed on the initial TVS. The failing PUL group will include both ectopic pregnancies and failing IUPs, since the location of the pregnancy may never be determined.

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