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Journal of Immunology Research
Volume 2015 (2015), Article ID 147973, 4 pages
Research Article

Serum Calprotectin: A Potential Biomarker for Neonatal Sepsis

1Neonatology and Neonatal Intensive Care Unit, IRCCS San Matteo Foundation, 27100 Pavia, Italy
2Pediatric Clinic, IRCCS San Matteo Foundation, 27100 Pavia, Italy
3Biometry and Statistics Service, IRCCS San Matteo Foundation, 27100 Pavia, Italy

Received 7 May 2015; Revised 1 August 2015; Accepted 2 August 2015

Academic Editor: Xiao-Feng Yang

Copyright © 2015 Lidia Decembrino et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. The correct diagnosis of neonatal sepsis is a relevant problem because sepsis is one of the most important causes of neonatal morbidity, mortality, and prolonged hospital stay. Calprotectin is an antimicrobial, calcium and zinc binding heterocomplex protein that could be used as a nonspecific marker for activation of granulocytes and mononuclear phagocytes. Calprotectin has been proposed for the diagnosis of inflammatory conditions. Our aim is to study serum calprotectin as a biomarker for neonatal sepsis diagnosis. Methods. 41 (20 females, 21 males) infants who underwent blood culture due to suspected sepsis were enrolled in the study. Serum calprotectin was measured by a commercial ELISA assay (Calprest, Eurospital, Trieste, Italy). Statistical analysis was performed using the statistical software package Stata 13.1 (Stata Corporation, College Station, Texas, USA). Results. 8 neonates (19.51%) showed sepsis with positive culture and 33 (80.49%) showed suspected sepsis. The optimal cut-off for calprotectin is 2.2 μg/mL with a sensitivity of 62.5% and a specificity of 69.7%. Conclusions. Calprotectin may be considered a promising early, sensitive, specific marker of sepsis thanks to the importance of calprotectin in defense mechanisms and physiological functions of the immune system.