Tools

Add a finding for this diagnosis

Add prevalence for this diagnosis

Switch to display mode

Switch to sensitivity and specificity

Sort findings by Tag

Sort findings by Differential Diagnosis

Jump To

Good Positive Likelihood Ratio

Poorly Diagnostic Findings

Mycoplasma Pneumonia: Likelihood Ratios

Introduction: Mycoplasma is one of the causes of an atypical Community Acquired Pneumonia.

[Edit Diagnosis] [Merge dx] [Add prevalence]

Tags: Infection Pulmonary Tag this Diagnosis.

Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
10000	0%
More, Edit...

The likelihood ratios of findings for Mycoplasma Pneumonia 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
[ + ] Mycoplasma PCR	+ 0 -	inf	0.6
sensitivity ~20% in young adults and 9% in children sensitivity 50% in first 3 weeks of infection Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586
[ + ] Mycoplasma IgM	+ 0 -	2.2	0.7
much more sensitive (90-100%) but less specific in young adults / children sensitivity 76% in first 3 weeks rising to 100% by 2 months in all comers Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Mycoplasma IgG + IgM	+ 0 -	1.9	0.8
sensitivity higher and specificity lower in young adults / children sensitivity 33% in first 3 weeks up to 76% at 2 months in all comers Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586
[ + ] Cold Agglutinins		Sensitivity = 50%
IgM antibodies; develop 1-2 weeks after infection Study: Clin Infect Dis 1993 Aug;17 Suppl 1:S79-82. PMID 8399943