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Good Positive and Negative Likelihood Ratios

Good Positive Likelihood Ratio

Poorly Diagnostic Findings

Acute Streptococcal Pharyngitis: Likelihood Ratios

Introduction: None written.

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Tags: Infection Tag this Diagnosis.

Differential Diagnoses include: Kawasaki Disease, Viral Pharyngitis

The likelihood ratios of findings for Acute Streptococcal Pharyngitis 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 Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] hearing loss	+ 0 -	2.9	0.9
>100.5F Study: Acad Emerg Med. 2000 Oct;7(10):1104-9. PMID: 11015241

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Centor Criteria	+ 0 -	1.5	0.9
=4 criteria: subjective or objective fever (>38C) exudative pharyngitis lack of cough tender cervical LAD Study: Br J Gen Pract. 2005 Aug;55(517):615-9. PMID: 16105370
[ + ] Centor Criteria	+ 0 -	1.4	0.9
=3 criteria: subjective or objective fever (>38C) exudative pharyngitis lack of cough tender cervical LAD Study: Br J Gen Pract. 2005 Aug;55(517):615-9. PMID: 16105370
[ + ] Centor Criteria	+ 0 -	1.5	0.8
>=3 criteria: subjective or objective fever (>38C) exudative pharyngitis lack of cough tender cervical LAD Study: Br J Gen Pract. 2005 Aug;55(517):615-9. PMID: 16105370