TFF3 and Nephropathy: FDA-approved representative biomarkers N-acetyl-beta-D-glycosaminidases (NAG), inflammatory mediators (trefoil factor-3 (TFF3), inflammatory mediators (trefoil factor-3 (TFF3)), glomerular filtration markers (Cyst C) and β2-microglobulin (β2-Mic) are used to diagnose kidney damage.