Gout: Likelihood Ratios

Introduction: None written.

The likelihood ratios of findings for Gout 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.)


Finding	Result	+LR	-LR
[ + ] Monosodium Urate Crystals	+ 0 -	inf	0.2
in synovial fluid during an acute attack Study: Ann Rheum Dis. 2006 Oct;65(10):1301-11. PMID: 16707533
[ + ] Monosodium Urate Crystals	+ 0 -	14	0.3
from synovial fluid in asymptomatic patients, i.e. in between attacks Study: Ann Rheum Dis. 2006 Oct;65(10):1301-11. PMID: 16707533
[ + ] Podagra	+ 0 -	32	0
i.e. clinical acute involvement of the great toe Study: Ann Rheum Dis. 2006 Oct;65(10):1301-11. PMID: 16707533
[ + ] Tophus on pinna		No accuracy specified.
Tophus may exude a chalky white substance if squeezed Study: no study specified.
[ + ] Uric Acid	+ 0 -	3	0.4
uric acid > 6 mg/dl in aymptomatic patients. Measuring levels in acute attacks is not recommended, as they can be normal. Note that cutoffs depend on gender and age. Study: Ann Rheum Dis. 2006 Oct;65(10):1301-11. PMID: 16707533