Figure 2: Receiver operating characteristic curve (ROC) of urine neutrophil gelatinase-associated lipocalin (uNGAL) compared with those of Systemic Lupus Erythematosus Disease Activity Index-2K renal score (SLEDAI-2K renal), urine protein creatinine index (uPCI), serum albumin and serum creatinine for the diagnosis of lupus nephritis (LN) activity. The area under the curve (AUC) for uNGAL was 0.79 (p<0.001). The symbol (+) represents the best cutoff value for uNGAL (73.43 ng/mg creatinine) with a sensitivity of 0.81 and a specificity of 0.62.