24h urine test can check several items, and the most common 24h urine test in clinical practice is to check urine protein and vanilloid tonsil in urine. If a patient has kidney disease and proteinuria is present in the routine urine test, it is necessary for the patient to collect 24h urine to determine the amount of total urine protein in 24h to further assess the degree of proteinuria and evaluate the patient’s kidney function. If the proteinuria is significantly higher than the standard, it indicates the presence of kidney disease and needs to be treated. The higher the proteinuria, the more severe the disease. In adrenal disease, 24h urine is taken to measure urinary vanilloid acid, which is a specific test for pheochromocytoma. If this indicator is elevated, the tumor of the adrenal gland can be clearly identified as pheochromocytoma, which can cause a significant increase in the secretion of epinephrine, norepinephrine and dopamine, resulting in a sharp increase in blood pressure and a rapid increase in heart rate, which can confirm the diagnosis of adrenal tumor.