Acute GI Bleeding: Likelihood Ratios

Introduction: Acute gastrointestinal bleeding, lumping lower and upper together here. See also Upper GI Bleed.

The likelihood ratios of findings for Acute GI Bleeding are listed below. See the left navigation bar to change the display.

Good Positive and Negative Likelihood Ratios

Finding	+LR	-LR	Comments, Study
Tagged RBC Scan	18.6	0.1	In animal models, sensitivity down to .04 - .1 ml/min flow. However, data suggests at least 22% mislocalization rate. Study: Radiographics. 2007 Jul-Aug;27(4):1055-70. PMID: 17620467 World J Gastroenterol. 2010 Aug 21;16(31):3957-63. PMID: 20712058
CT angiography	5.9	0.1	In animal models, sensitivity down to .3 ml/min Study: World J Gastroenterol. 2010 Aug 21;16(31):3957-63. PMID: 20712058
Angiography Duplicate	inf	0.4	for upper GI bleeding. sensitivity 63-90% Study: Radiographics. 2007 Jul-Aug;27(4):1055-70. PMID: 17620467

Good Negative Likelihood Ratio

1.3

0.3

sensitivity 92-98%, specificity 30-100%

Study: Radiographics. 2007 Jul-Aug;27(4):1055-70. PMID: 17620467

Good Positive Likelihood Ratio

inf

0.6

for lower GI bleeding. sensitivity 40-86%

Study: Radiographics. 2007 Jul-Aug;27(4):1055-70. PMID: 17620467