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Good Positive and Negative Likelihood Ratios

Spontaneous Bacterial Peritonitis: Likelihood Ratios

Introduction: This diagnosis carries a high mortality rate, around 30%. Diagnostic paracentesis is critical in the diagnosis (and may be therapeutic in non-infective ascites).

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Tags: Hepatic Infection Tag this Diagnosis.

Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Cirrhosis patients admitted to the hospital 27% JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166
Cirrhosis patients with prior SBP 0% Much higher prevalence - these patients are placed on prophylactic antibiotics.
Cirrhosis patients with low ascitic protein 0% Much higher. These patients get prophylactic antibiotics.
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The likelihood ratios of findings for Spontaneous Bacterial Peritonitis are listed below. See the left navigation bar to change the display.

Good Positive and Negative Likelihood Ratios

Finding +LR-LR Comments, Study
Serum-Ascites Albumin Gradient Edit 4.50.1

>=1.1g/dl

Study: JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166

Ascitic Fluid PMN Edit 10.60.2

>500/ul

Study: JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166

Ascitic Fluid WBC Edit 9.60.3

>1000/ul

Study: JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166

Blood-Ascites pH Gradient Edit 7.30.3

>0.10

Study: JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166

Ascitic Fluid pH Edit 8.90.3

<7.35

Study: JAMA. 2008;299(10):1166-1178. http://jama.ama-assn.org/cgi/content/full/299/10/1166