• Gebhard Wagener, Moury Minhaz, Fallon A Mattis, Mihwa Kim, Jean C Emond, and H Thomas Lee.
• Department of Anesthesiology, College of Physicians and Surgeons, Columbia University, New York, NY, USA. gw72@columbia.edu
• Nephrol. Dial. Transplant. 2011 May 1;26(5):1717-23.

BackgroundUrinary neutrophil gelatinase-associated lipocalin (NGAL) is a novel, sensitive and specific biomarker that is rapidly released after kidney injury. It predicts acute kidney injury (AKI) in multiple clinical scenarios. We hypothesized that urinary NGAL can predict AKI after liver transplantation.MethodsUrine was collected in 92 patients undergoing liver transplantation (18 living-related and 74 deceased) before surgery, after reperfusion of the liver graft and then 3, 18 and 24 h later. NGAL was analyzed with enzyme-linked immunosorbent assay and corrected for dilution/concentration by calculating urinary NGAL/urine creatinine ratios. AKI was defined by Risk-Injury-Failure-Loss-Endstage stage kidney disease (RIFLE)-risk criteria (increase of serum creatinine by >50%).ResultsUrinary NGAL/urine creatinine ratio was low prior to surgery and increased immediately after reperfusion, peaked 3 h later and remained elevated at 18 and 24 h. Urinary NGAL/urine creatinine ratios were higher in patients with post-operative (post-OP) AKI defined by RIFLE--risk criteria 3 and 18 h after reperfusion. The area under the curve of the receiver operator characteristics curve of urinary NGAL/urine creatinine ratio to predict AKI was 0.800 (95% CI: 0.732-0.869, P < 0.0001) 3 h and 0.636 (95% CI: 0.551-0.720, P < 0.005) 18 h after reperfusion.ConclusionsWe conclude that urinary NGAL/urine creatinine ratio is able to predict post-OP AKI 3 and 18 h after transplantation with good discrimination.

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