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Trichomoniasis: Likelihood Ratios

Introduction: Trichomoniasis is a common sexually transmitted disease caused by Trichomonas vaginalis.

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Tags: Gynecologic Infection Tag this Diagnosis.

Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
Women age 14-49, United States	3%	Trichomonas vaginalis infection detected by PCR of self-collected vaginal swabs by 3754 women. Clin Infect Dis. 2007 Nov 15;45(10):1319-26.
	66%
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The likelihood ratios of findings for Trichomoniasis 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.)

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Vaginal pH	+ 0 -	1.1	0.9
pH >4.5 Study: Hopkins Antibiotics Guide
[ + ] Wet Mount		Sensitivity = 65%
of vaginal discharge, looking for motile trichomonads Study: Hopkins Antibiotics Guide
[ + ] Strawberry Cervix		Sensitivity = 5%
specificity not mentioned Study: Hopkins Antibiotics Guide