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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Editorial Board Member: Gillery, Philippe / Kazmierczak, Steven / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Schlattmann, Peter / Whitfield, John B.

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Urinary neutrophil gelatinase-associated lipocalin (NGAL) as an early marker of acute kidney injury in critically ill multiple trauma patients

Konstantinos Makris1 / Nikos Markou2 / Effimia Evodia3 / Eleni Dimopoulou4 / Ioannis Drakopoulos5 / Konstantina Ntetsika6 / Demetrios Rizos7 / George Baltopoulos8 / Alexander Haliassos9

1Clinical Biochemistry Department, KAT General Hospital, Kiffissia, Athens, Greece

2University of Athens, Intensive Care Unit, KAT General Hospital, Kiffissia, Athens, Greece

3University of Athens, Intensive Care Unit, KAT General Hospital, Kiffissia, Athens, Greece

4University of Athens, Intensive Care Unit, KAT General Hospital, Kiffissia, Athens, Greece

5Clinical Biochemistry Department, KAT General Hospital, Kiffissia, Athens, Greece

6Clinical Biochemistry Department, KAT General Hospital, Kiffissia, Athens, Greece

7University of Athens, Hormone Laboratory, Aretaieion Hospital, Athens, Greece

8University of Athens, Intensive Care Unit, KAT General Hospital, Kiffissia, Athens, Greece

9Diamedica SA, Athens, Greece

Corresponding author: Dr. Konstantinos Makris, Clinical Biochemistry Department, KAT General Hospital, 2, Nikis Street, 14561 Kifissia, Athens, Greece Phone: +30-210-4961075, Fax: +30-210-9674137,

Citation Information: Clinical Chemistry and Laboratory Medicine. Volume 47, Issue 1, Pages 79–82, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2009.004, December 2008

Publication History

Received:
2008-08-20
Accepted:
2008-09-15
Published Online:
2008-12-05

Abstract

Background: Neutrophil gelatinase-associated lipocalin (NGAL), an iron-transporting protein rapidly accumulating in the kidney tubules and urine after nephrotoxic and ischemic insults, has been put forward as an early, sensitive, non-invasive biomarker for acute kidney injury (AKI). The aim of this study was to evaluate urinary NGAL levels as a predictor of early AKI (first 5 days after injury) in multi-trauma patients.

Methods: We studied multi-trauma adult patients admitted to the intensive care unit of a trauma hospital. Exclusion criteria were a) known cardiac or chronic kidney disease, and b) initial evaluation after more than 24 h had elapsed from injury. Urinary NGAL was measured using an ELISA technique upon admission and at 24 and 48 h. Presence of AKI was defined by the risk injury failure loss and end-stage kidney classification (RIFLE) criteria. Data are reported as median and interquartile range.

Results: A total of 31 patients (25 male, 6 female) were studied. NGAL levels at admission were significantly higher among patients who subsequently developed AKI [155.5 (50.5–205.9) ng/mL vs. 8.0 (5.7–17.7) ng/mL, p=0.0000] and these higher levels persisted over the following 2 days. On the basis of receiver-operating characteristic analysis both NGAL and serum creatinine baseline measurements could predict AKI [area under the curve (95% confidence interval) 0.977 (0.823–0.980) and 0.789 (0.556–0.906), respectively], but the area under the curve for NGAL was significantly larger (p=0.024). A cut-off point >25 ng/mL for NGAL had a sensitivity of 0.91 and specificity of 0.95 in predicting AKI.

Conclusions: Urinary NGAL can be used from the 1st day of injury as a reliable predictor of early AKI in multi-trauma patients.

Clin Chem Lab Med 2009;47:79–82.

Keywords: acute kidney injury; acute renal failure; multi-trauma patients; neutrophil gelatinase-associated lipocalin (NGAL)

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