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Good Positive and Negative Likelihood Ratios

Good Negative Likelihood Ratio

Good Positive Likelihood Ratio

Poorly Diagnostic Findings

Upper GI Bleed: Likelihood Ratios

Introduction: None written.

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Tags: Gastrointestinal Problem Tag this Diagnosis.

The likelihood ratios of findings for Upper GI Bleed 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 Negative Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] Upper Endoscopy	+ 0 -	1.3	0.3
specificity ranges from 30-100% Study: Radiographics. 2007 Jul-Aug;27(4):1055-70. PMID: 17620467

Good Positive Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] Nasogastric Lavage	+ 0 -	4.7	0.6
in patients without hematemesis Note that in principle if there is no bile, bleeding distal to the pylorus cannot be excluded. Study: Ann Emerg Med. 2004 Apr;43(4):525-32. PMID 15039700

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] History of Ulcer		Sensitivity = 40%
specificity not assessed Study: Gastrointest Endosc. 1995 Nov;42(5):390-7. PMID 8566625
[ + ] Hematochezia		Sensitivity = 14%
i.e. bright red blood in stool specificity not assessed. Study: Emerg Med Clin North Am. 1999 Feb;17(1):239-61, x. PMID 10101349