Table 3.

Sensitivity, specificity, positive predictive values, and negative predictive values of 24-hour urinary NGAL excretion at different cut-off values for the diagnosis of renal involvement in SLE patients.

Cutoff value (mg/day)	Sensitivity (%)	Specificity (%)	Positive predictive value (%)	Negative predictive value (%)
24.00	70.8	62.5	85	41.7
27.00	70.8	75	84.5	46.2
31.00	70.8	87.5	94.4	50
36.00	66.7	87.5	94.1	46.7

NGAL: neutrophil gelatinase-associated lipocalin; SLE: systemic lupus erythematosus.