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Appendicitis: Sensitivity and Specificity

Introduction: None written.

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Tags: Gastrointestinal Problem Infection Tag this Diagnosis.

Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Adults >60 years old, abdominal pain in the ED 4% http://jama.ama-assn.org/cgi/content/abstract/276/19/1589
Adults, abdominal pain in ambulatory setting 1% http://jama.ama-assn.org/cgi/content/abstract/276/19/1589
Adults <60 years old, abdominal pain in ED 25% http://jama.ama-assn.org/cgi/content/abstract/276/19/1589
More, Edit...

The sensitivity and specificity of findings for Appendicitis 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.)
Sensitive and Specific Findings
FindingResult SensitivitySpecificity
[ + ] Abdominal CT + 0 - 94%95%
Specific Findings
FindingResult SensitivitySpecificity
[ + ] Psoas sign + 0 - 16%95%
[ + ] Appendicolith + 0 - 65%86%
Sensitive Findings
FindingResult SensitivitySpecificity
[ + ] Pain preceeding vomiting + 0 - 100%64%
[ + ] Abdominal US + 0 - 86%81%
Negative Findings
FindingResult SensitivitySpecificity
[ + ] Emesis + 0 - 51%45%
[ + ] Nausea + 0 - 58%37%
Poorly Diagnostic Findings
FindingResult SensitivitySpecificity
[ + ] Abdominal Rigidity + 0 - 27%83%
[ + ] Migration of Pain + 0 - 64%82%
[ + ] Fever + 0 - 67%79%
[ + ] Rectal tenderness + 0 - 41%77%
[ + ] Rebound + 0 - 63%69%
[ + ] Fever + 0 - 47%64%
[ + ] Guarding + 0 - 74%57%
[ + ] RLQ Pain + 0 - 81%53%
[ + ] Leukocytosis + 0 - 76%52%
[ + ] No similar pain previously + 0 - 81%41%
[ + ] Anorexia + 0 - 68%36%
Findings With Unspecified Accuracy
FindingResult SensitivitySpecificity
[ + ] Obturator sign No accuracy specified.
[ + ] Rovsing's Sign No accuracy specified.