GetTheDiagnosis.org

Welcome, guest.
Login or Sign up to edit.

Add an entry

Search:
 

Tools

Add a finding for this diagnosis

Add prevalence for this diagnosis

Switch to calculator mode to see positive predictive value

Switch to likelihood ratios

Sort findings by Tag

Sort findings by Differential Diagnosis

Jump To

Specific Findings

Sensitive Findings

Poorly Diagnostic Findings

Community-Acquired Pneumonia: Sensitivity and Specificity

Introduction: See also http://jama.ama-assn.org/cgi/reprint/278/17/1440

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

Tags: Infection Pulmonary Tag this Diagnosis.

The sensitivity and specificity of findings for Community-Acquired Pneumonia are listed below. See the left navigation bar to change the display.

Specific Findings

Finding SensitivitySpecificity Comments, Study
Bronchial breath sounds Edit 13%96%

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Egophony Edit 28%95%

Note that another study (J Emerg Med. 1989 May-Jun;7(3):263-8. PMID 2745948) found sens = 8%, spec = 96%.

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Dullness to percussion Edit 26%94%

Note that another study (J Emerg Med. 1989 May-Jun;7(3):263-8. PMID 2745948) found sensitivity = 12%, specificity = 94%.

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Tachycardia Edit 25%90%

>100bpm

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Fever Edit 30%89%

>38C

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Sensitive Findings

Finding SensitivitySpecificity Comments, Study
No History of Asthma Edit 92%76%

i.e. presence of asthma makes PNA less likely

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Poorly Diagnostic Findings

Finding SensitivitySpecificity Comments, Study
Crackles Edit 50%81%

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Decreased breath sounds Edit 48%81%

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Decreased O2 saturation Edit 52%80%

<95%

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Leukocytosis Edit 46%80%

>10k/ul

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Tachypnea Edit 50%79%

>22 breaths/min

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Clinical diagnosis Edit 60%68%

by general practitioner

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Elevated CRP Edit 73%65%

>20mg/L

Study: Br J Gen Pract. 2007 Jul;57(540):547-54.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17727747

Rhonchi Edit 53%63%

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647

Cough Edit 50%50%

finding's PLR and NLR are not statistically significantly different from 1

Study: Ann Intern Med. 1990 Nov 1;113(9):664-70. PMID 2221647