Color ultrasound suggests that both kidneys are normal does not mean that renal function must be normal, color ultrasound itself has certain limitations, but also need to improve renal function, renal ECT and other tests. Ultrasound is usually used to clarify the size, volume, texture of the kidney, whether there are stones and tumors, etc., while the assessment of renal function of the examination in addition to ultrasound, but also includes urea nitrogen, creatinine, electrolytes, urinary routine, etc., through which the indicators can be assessed to assess the degree of damage to renal function, to clarify the biochemical and metabolic function of renal tissues, but also to observe the circulatory function and so on. It is recommended that when patients undergo physical examination, they should follow the doctor’s instructions to choose different imaging tests combined with biochemical samples for different symptoms to improve the examination results, so as to avoid delaying the condition.