Document Detail

Diagnostic accuracy of icteric index to detect abnormal total bilirubin values.
MedLine Citation:
PMID:  22859392     Owner:  NLM     Status:  MEDLINE    
AIMS: Total bilirubin tests are individually inexpensive but can result in huge costs to healthcare systems worldwide, because they are very commonly requested. The main objective of this study was to evaluate the diagnostic accuracy of the icteric index, a test with zero reagent cost, as a preliminary biomarker to decide when total bilirubin measurement is necessary.
METHODS: We retrospectively reviewed all the requested total bilirubin values and their corresponding icteric index results in a 2-year period (2010-11). Receiver operating characteristic (ROC) curve analysis was used to determine the optimal icteric index cut-off value to discriminate between normal and abnormal bilirubin values (>20.5 μmol/l; >1.2 mg/dl).
RESULTS: The study included total bilirubin and icteric index results of 100,207 patients. The ROC curve analysis suggested 34.2 μmol/l (2 mg/dl) as the optimal icteric index threshold to identify abnormal bilirubin values. The area under the curve was 0.981. Regardless of the patient population studied (primary care, hospital and different individual hospital departments), sensitivity was greater than 94% and specificity was over 98%. Likelihood ratio values provided strong evidence that total bilirubin is less than 20.5 μmol/l (<1.2 mg/dl) when the icteric index is less than 34.2 μmol/l (<2 mg/dl).
CONCLUSIONS: This study supports the use of the icteric index to identify patients with abnormal total bilirubin values. Considerable economic savings can be achieved if this strategy is applied on a clinical daily basis. Its implementation and report should be discussed and planned by laboratory professionals together with requesting physicians.
Maria Salinas; Maite López-Garrigós; Javier Lugo; Mercedes Gutiérrez; Lucia Flors; Carlos Leiva-Salinas
Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2012-08-02
Journal Detail:
Title:  Journal of clinical pathology     Volume:  65     ISSN:  1472-4146     ISO Abbreviation:  J. Clin. Pathol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-24     Completed Date:  2012-12-07     Revised Date:  2014-01-07    
Medline Journal Info:
Nlm Unique ID:  0376601     Medline TA:  J Clin Pathol     Country:  England    
Other Details:
Languages:  eng     Pagination:  928-33     Citation Subset:  AIM; IM    
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MeSH Terms
Aged, 80 and over
Bilirubin / blood*
Child, Preschool
Middle Aged
ROC Curve
Retrospective Studies
Sensitivity and Specificity
Severity of Illness Index*
Young Adult
Reg. No./Substance:
Comment In:
J Clin Pathol. 2013 Dec;66(12):1095-7   [PMID:  23703855 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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