Clinical features

Why?

Whitish or yellow-green aspirate makes upper GI bleeding less likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability
suspected acute upper GI bleeding c (pre-test probability: 39%)	upper GI bleeding (endoscopy)	grossly bloody aspirate	2.5 (1.4 to 4.6)	62%
		slightly bloody aspirate	1.1 (0.33 to 3.4)	40%
		coffee grounds aspirate	0.95 (0.25 to 3.6)	38%
		whitish or yellow-green aspirate	0.093 (0.013 to 0.66)	6%

A negative gastro-occult test makes upper GI bleeding much less likely

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected acute upper GI bleeding c (pre-test probability: 39%)	upper GI bleeding (endoscopy)	gastro-occult positive	5.2 (2.7 to 10)	77%	0.051 (0.0075 to 0.35)	3%

Note:

• Looking for bile is little use at diagnosing or excluding upper GI bleeding ^c