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Poorly Diagnostic Findings

Bulimia Nervosa: Sensitivity and Specificity

Introduction: Binging plus/minus purging.

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Prevalence

Population / Calculator	Prevalence	Comments / Study / Link
Young Adult Females	1%	Int J Eat Disord. 2001 Nov;30(3):279-87. PMID: 11746287
500	10%
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The sensitivity and specificity of findings for Bulimia Nervosa 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	Sensitivity	Specificity
[ + ] Abnormal Serum Bicarbonate	+ 0 -	25%	84%
Study: Int J Eat Disord. 1997 Jan;21(1):95-8. PMID: 8986523
[ + ] Elevated Serum Amylase		Sensitivity = 45%
specificity not assessed. Study: Int J Eat Disord. 1999 Sep;26(2):223-7. PMID: 10422613