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Good Positive and Negative Likelihood Ratios

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Ectopic Pregnancy: Likelihood Ratios

Introduction: See Pregnancy for beta-hCG diagnostic test accuracies.

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Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Pregnancies 2% http://www.utdol.com/online/content/topic.do?topicKey=gen_gyne/6639
Women presenting to ED with first trimester bleeding, pain, or both 12% 6-16%

http://www.utdol.com/online/content/topic.do?topicKey=gen_gyne/6639

More, Edit...

The likelihood ratios of findings for Ectopic Pregnancy are listed below. See the left navigation bar to change the display.

Good Positive and Negative Likelihood Ratios

Finding +LR-LR Comments, Study
Trans-Vaginal Ultrasound Edit inf0.3

spec = 99.9%. Diagnostic criteria included sonographic evidence of an empty intrauterine cavity and adnexal mass and/or extrauterine gestational sac. For all patients where the diagnosis was "pregnancy of unknown location", ectopic pregnancy was later confirmed

Study: Hum Reprod. 2007 Nov;22(11):2824-8. PMID 17855406

Good Positive Likelihood Ratio

Finding +LR-LR Comments, Study
Cervical motion tenderness Edit 50.6

Study: Crochet, J. R., Bastian, L. A., & Chireau, M. V. (2013). Does This Woman Have an Ectopic Pregnancy? JAMA, 309(16), 1722. doi:10.1001/jama.2013.3914

Adnexal Mass Edit 2.30.9

Study: Crochet, J. R., Bastian, L. A., & Chireau, M. V. (2013). Does This Woman Have an Ectopic Pregnancy? JAMA, 309(16), 1722. doi:10.1001/jama.2013.3914

Poorly Diagnostic Findings

Finding +LR-LR Comments, Study
Adnexal tenderness Edit 1.70.6

Study: Crochet, J. R., Bastian, L. A., & Chireau, M. V. (2013). Does This Woman Have an Ectopic Pregnancy? JAMA, 309(16), 1722. doi:10.1001/jama.2013.3914