title: Value of serum procalcitonin levels in predicting spontaneous bacterial peritonitis.
abstract: OBJECTIVE
  Spontaneous bacterial peritonitis (SBP) is a life-threatening disease that poses a great diagnostic challenge to clinicians. We aimed to systemically and quantitatively summarize the current evidence on the diagnostic value of the procalcitonin (PCT) test in identifying SBP.
  
  
  METHODS
  We searched EMBASE, MEDLINE, the Cochrane database and reference lists of relevant articles with no language restrictions through May 2012. We selected original research that reported the diagnostic performance of PCT alone or compared with other biomarkers to diagnose SBP. We summarized test performance characteristics using forest plots, summary receiver operating characteristic curves and bivariate random effects models.
  
  
  RESULTS
  We found only three qualifying studies examining 181 episodes of suspected infection with 50 (27.6%) confirmed SBP episodes from 3 countries. Bivariate pooled sensitivity, specificity, positive likelihood ratios and negative likelihood ratios were 86% (95%CI: 73%-94%), 80% (95%CI: 72%-87%), 7.73 (95%CI: 0.91-65.64) and 0.14 (95%CI: 0.01-1.89), respectively. The global measures of accuracy, area under the receiver operating curve (AUROC) and diagnostic odds ratio (DOR), showed PCT has excellent discriminative capability and individual study showed serum PCT testing has better accuracy than ascitic PCT, serum CRP or IL-6 testing. There was evidence of significant heterogeneity but no evidence of publication bias.
  
  
  CONCLUSIONS
  The existing literature suggests moderate to high accuracy for PCT as a diagnostic aid for SBP. However, larger, appropriately designed prospective studies are needed to conclusively address the value of serum PCT testing in SBP diagnosis.
authors.affiliation: Department of Clinical Laboratory, The First Affiliated Hospital of Guangzhou Medical College, China.
authors.forename: Dan-Hong
authors.initials: DH
authors.lastname: Su
authors.forename: Chao
authors.initials: C
authors.lastname: Zhuo
authors.forename: Kang
authors.initials: K
authors.lastname: Liao
authors.forename: Wei-Bu
authors.initials: WB
authors.lastname: Cheng
authors.forename: Hai
authors.initials: H
authors.lastname: Cheng
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Zhao
mesh_terms: D001424:Bacterial Infections / Q000097:blood* / Q000382:microbiology*; D015415:Biomarkers / Q000097:blood; D002116:Calcitonin / Q000097:blood*; D015740:Calcitonin Gene-Related Peptide; D006801:Humans; D008103:Liver Cirrhosis / Q000150:complications; D010538:Peritonitis / Q000097:blood* / Q000382:microbiology*; D011237:Predictive Value of Tests; D011498:Protein Precursors / Q000097:blood*; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers; C000606589:CALCA protein, human; D011498:Protein Precursors; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide