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Good Positive and Negative Likelihood Ratios

Good Negative Likelihood Ratio

Good Positive Likelihood Ratio

Poorly Diagnostic Findings

Septic Arthritis: Likelihood Ratios

Introduction: None written.

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Tags: Infection Tag this Diagnosis.

Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Patients presenting with acute monoarthritis 8% Another study reported 27%.

JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
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The likelihood ratios of findings for Septic Arthritis 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 Positive and Negative Likelihood Ratios
FindingResult +LR-LR
[ + ] Synovial LDH + 0 - 20
[ + ] Synovial PMN + 0 - 3.50.3
[ + ] Synovial WBC + 0 - 7.80.4
[ + ] Rheumatoid Arthritis + 0 - 2.50.4
Good Negative Likelihood Ratio
FindingResult +LR-LR
[ + ] Elevated ESR + 0 - 1.30.2
[ + ] Leukocytosis + 0 - 1.40.3
[ + ] History of HIV + 0 - 1.60.4
[ + ] Elevated CRP + 0 - 1.60.4
Good Positive Likelihood Ratio
FindingResult +LR-LR
[ + ] Synovial WBC + 0 - 290.7
[ + ] Recent Joint Surgery + 0 - 60.8
[ + ] Age + 0 - 3.80.9
[ + ] Synovial Glucose + 0 - 3.40.6
[ + ] Joint Prosthesis + 0 - 3.20.7
[ + ] Diabetes + 0 - 30.9
[ + ] Skin infection + 0 - 2.70.8
Poorly Diagnostic Findings
FindingResult +LR-LR
[ + ] Synovial Protein + 0 - 0.91.1
[ + ] hearing loss + 0 - 0.71.7
[ + ] Pain in Joint Sensitivity = 85%
[ + ] Joint Edema Sensitivity = 78%

 

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