In renal tubular injury, proximal tubular function and distal tubular function should be examined, including α1-microglobulin, β2-microglobulin; urine specific gravity, urine osmolality and so on. 1. Proximal tubular function test: mainly includes α1-microglobulin, β2-microglobulin and retinol-binding protein. The main function of proximal tubule is reabsorption, impaired function of proximal tubule will have reabsorption dysfunction. 2. Functional examination of distal tubule: it mainly includes urine specific gravity, urine osmolality, etc. The main function of distal tubule is reabsorption. The main role of the distal tubule is to regulate the concentration and dilution of urine, and damage to the distal tubule will lead to abnormal urine specific gravity and osmolality. If any discomfort occurs, it is recommended to go to the regular hospital in time, under the guidance of the physician for examination and treatment.