LCN2 and acute kidney injury: Also, they showed that the presence of one RTEC, RTECC or GC/HPF has a specificity of 91.3% but low sensitivity of 22.4%for the diagnosis of AKI, while for severe AKI stage (2 or 3), the specificity was 89.9% and sensitivity was 29.6% with increasing predictive value by adding urinary NGAL.