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Good Positive and Negative Likelihood Ratios

Good Positive Likelihood Ratio

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Retinal Detachment: Likelihood Ratios

Introduction: Also known as posterior vitreous detachment (PVD).

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Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
Acute onset of floaters and/or flashes	14%	JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426
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The likelihood ratios of findings for Retinal Detachment 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
[ + ] Vitreous Pigment or Hemorrhage	+ 0 -	7.3	0.1
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426
[ + ] Vitreous Pigment	+ 0 -	44	0.2
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426
[ + ] Vitreous Hemorrhage	+ 0 -	10	0.5
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426

Good Positive Likelihood Ratio
Finding	Result	+LR	-LR
[ + ] Vitreous Pigment and Hemorrhage	+ 0 -	40	0.6
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426
[ + ] Subjective Vision Reduction with Floaters and Flashes	+ 0 -	5	0.6
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] Floaters and Flashes	+ 0 -	1.2	0.9
Study: JAMA. 2009 Nov 25;302(20):2243-9. PMID: 19934426