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Good Positive and Negative Likelihood Ratios

Good Negative Likelihood Ratio

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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.

Good Positive and Negative Likelihood Ratios

Finding +LR-LR Comments, Study
Synovial LDH Edit 20

>250 U/L

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Synovial PMN Edit 3.50.3

>90%

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2
Synovial WBC
Duplicate Edit		 7.80.4

>50k

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Rheumatoid Arthritis Edit 2.50.4

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2

Good Negative Likelihood Ratio

Finding +LR-LR Comments, Study
Elevated ESR Edit 1.30.2

>30mm/hr

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Leukocytosis Edit 1.40.3

>10,000/ul

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
History of HIV Edit 1.60.4

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2
Elevated CRP Edit 1.60.4

>100mg/l

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2

Good Positive Likelihood Ratio

Finding +LR-LR Comments, Study
Synovial WBC
Duplicate Edit		 290.7

>100k

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Recent Joint Surgery Edit 60.8

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Age Edit 3.80.9

>80 years

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Synovial Glucose Edit 3.40.6

Low, defined differently in different studies.

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Joint Prosthesis Edit 3.20.7

for hip or knee

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Diabetes Edit 30.9

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Skin infection Edit 2.70.8

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478

Poorly Diagnostic Findings

Finding +LR-LR Comments, Study
Synovial Protein Edit 0.91.1

>3g/dl

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
hearing loss Edit 0.71.7

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2
Pain in Joint Edit Sensitivity = 85%

specificity not evaluated

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478
Joint Edema Edit Sensitivity = 78%

specificity not assessed

Study: JAMA. 2007;297:1478-1488. http://jama.ama-assn.org/cgi/content/full/297/13/1478/JRC70001T2

 

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