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Electronic Monitor

Small Bowel Obstruction: Likelihood Ratios

Introduction: None written.

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Tags: Gastrointestinal Problem Tag this Diagnosis.

The likelihood ratios of findings for Small Bowel Obstruction 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.)

Blood Test
Finding	Result	+LR	-LR
[ + ] Elevated D-dimer	+ 0 -	1.9	0.6
for strangulated SBO Study: Medicina (Kaunas). 2007;43(11):850-4. PMID: 18084141
[ + ] Elevated Serum Amylase		No accuracy specified.
Study: no study specified.
[ + ] Elevated Serum Lactate	+ 0 -	6.9	0.1
for ischemia Study: Am J Surg 1994 Jun;167(6):575-8. PMID 8209931
[ + ] Leukocytosis		No accuracy specified.
Study: no study specified.

Combination of Tests
Finding	Result	+LR	-LR
[ + ] Clinical diagnosis	+ 0 -	75	0.3
Study: Scand J Gastroenterol. 1994 Aug;29(8):715-21 PMID: 7973431

Electronic Monitor
Finding	Result	+LR	-LR
[ + ] Tachycardia		No accuracy specified.
Study: no study specified.

History
Finding	Result	+LR	-LR
[ + ] Age	+ 0 -	2.2	0.5
for SBO as final dx of abdominal pain Study: Eur J Surg. 1998 Oct;164(10):777-84. PMID: 9840308
[ + ] Emesis	+ 0 -	2.2	0.4
for SBO as final dx of abdominal pain Emesis is more common in proximal small bowel obstruction than in distal small bowel obstruction Study: Eur J Surg. 1998 Oct;164(10):777-84. PMID: 9840308
[ + ] History of Abdominal Surgery	+ 0 -	2.6	0.4
for SBO as final dx of abdominal pain Study: Eur J Surg. 1998 Oct;164(10):777-84. PMID: 9840308

Physical Exam
Finding	Result	+LR	-LR
[ + ] Abdominal Rigidity	+ 0 -	2.7	0.9
for SBO as final dx of abdominal pain Study: Eur J Surg. 1998 Oct;164(10):777-84. PMID: 9840308
[ + ] hearing loss		No accuracy specified.
Study: no study specified.
[ + ] Tachycardia		No accuracy specified.
Study: no study specified.

Renal
Finding	Result	+LR	-LR
[ + ] hearing loss		No accuracy specified.
Study: no study specified.

Vital Signs
Finding	Result	+LR	-LR
[ + ] hearing loss		No accuracy specified.
Study: no study specified.
[ + ] Tachycardia		No accuracy specified.
Study: no study specified.