Renal tubular triple test is to check the function of renal tubules mainly including urinary β2 microglobulin, urinary retinol-binding protein, urinary NAG enzyme. Urine β2 microglobulin is mainly to check the function of proximal renal tubules, which will be significantly elevated when the patient has acute tubular injury and chronic renal failure. Urinary retinol-binding protein mainly clarifies the renal tubules that show a decrease in reabsorption function. In case of tubulointerstitial lesions, urinary retinol-binding protein concentration will be elevated, which is also useful for determining the prognosis of tubular function decline. Elevated urinary NAG enzyme activity can also clarify the occurrence of tubular function damage, especially in the early stage of one of the more sensitive indicators. If there is any abnormality in the three tests of renal tubules, you should consult a regular hospital and under the guidance of a professional doctor to clarify the specific reasons and deal with it positively.