Kidney function examination mainly includes the following aspects: 1) urine examination; 2) routine blood test to check creatinine and urea nitrogen in blood, including other substances in blood; 3) isotope examination to make isotope renogram, often also called renal ECT, to view the changes of left and right side kidney function through isotope renogram; 4) using formula to calculate kidney function. Kidney function is a problem that involves the function of the kidney itself, and there are more ways to check it clinically, so you can consult with a nephrologist.