The normal value of urinary potassium is 25-125 mmol/24h. Urinary potassium is the measurement of the concentration of potassium in the urine for 24 hours, which directly reflects the kidney function. No alcohol should be consumed three days before the test, and all urine for 24 hours should be kept at room temperature between 2-4°C. Before the urine potassium measurement, no strenuous exercise is allowed, maintain a good diet and rest, and stop using drugs that affect urine potassium levels, such as diuretics and adrenocorticotropic hormones, one week before the test. Women who are menstruating or who have a cold are not suitable for urine potassium tests, as they may affect the results. An increased urinary potassium level can be seen in renal hypertension, diabetic ketosis, primary kidney disease, etc. Decreased urinary potassium can be seen in severe glomerulonephritis, pyelonephritis or chronic renal failure, as well as the intake of drugs such as narcotics and epinephrine, which can also lower urinary potassium. If there are changes in urinary potassium, it is important to seek medical attention to avoid delaying treatment.