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 and Negative Likelihood Ratios

Poorly Diagnostic Findings

Rheumatoid Arthritis: Likelihood Ratios

Introduction: None written.

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

Tags: Autoimmune Musculoskeletal Tag this Diagnosis.

Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
argentina	1%
More, Edit...

The likelihood ratios of findings for Rheumatoid 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
Finding	Result	+LR	-LR
[ + ] Anti-CCP Antibodies	+ 0 -	13.4	0.3
Study: Ann Intern Med. 2007 Jun 5;146(11):797-808. PMID: 17548411
[ + ] Rheumatoid Factor	+ 0 -	4	0.3
specificity 80-95% depending on control population (e.g. age). Sensitivity may be as low as 60% in initial stages of disease. Study: Am Fam Physician. 2002 Mar 15;65(6):1073-80. PMID: 11925083

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Elevated ESR		Sensitivity = 50%
Specificity not listed but reportedly low. Study: Am Fam Physician. 2002 Mar 15;65(6):1073-80. PMID: 11925083