Neutrophil-lymphocyte ratio is associated with all-cause mortality among critically ill patients with acute kidney injury.

•This is the first study to investigate if the neutrophil-lymphocyte ratio (NLR) can be used as a biomarker to predict the mortality of patients with acute kidney injury.•We include sufficient numbers of participants of 13,678.•Our analysis indicates that a higher level of NLR is associated with increased risk of 30-day and 90-day mortality in AKI patients.