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Good Positive and Negative Likelihood Ratios

Good Positive Likelihood Ratio

Ruptured Ectopic Pregnancy: Likelihood Ratios

Introduction: A ruptured ectopic pregnancy will cause hemoperitoneum and requires emergent surgery.

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Tags: Gynecologic Obstetrical Tag this Diagnosis.

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

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Good Positive and Negative Likelihood Ratios
Finding	Result	+LR	-LR
[ + ] Heart Rate to Systolic Blood Pressure Ratio	+ 0 -	2.2	0.4
HR / SBP > 0.7 Study: Am J Obstet Gynecol. 2003 Nov;189(5):1293-6. PMID: 14634556

Good Positive Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] Hypotension	+ 0 -	9	0.7
SBP < 100 mmHg Study: Am J Obstet Gynecol. 2003 Nov;189(5):1293-6. PMID: 14634556
[ + ] Tachycardia	+ 0 -	7	0.8
Per PMID 2293828, sensitivity is only 45% even with hypotension, suggesting a possible parasympathetic reaction. Study: Am J Obstet Gynecol. 2003 Nov;189(5):1293-6. PMID: 14634556