What is the normal urine sodium concentration?

Urine sodium concentration measurement refers to the concentration of sodium in urine for 24 hours. The normal value is 130-260mmol/24 hours. Urine sodium mainly comes from sodium salt components in food. The balance of sodium in human body depends on the regulation of kidney. Therefore, through the determination of urine sodium, it can be determined whether the sodium salt intake is sufficient, whether there is a large amount of deficiency, and whether the function of kidney regulating sodium is normal. Urine sodium can be used to help monitor low-salt diet and postoperative electrolyte situation, used to judge the electrolyte level of patients with vomiting, severe diarrhea, etc. Before checking urine, prevent salty diet, keep urine samples in 2-4℃ environment. Women during menstruation, colds, etc. Try not to do urine sodium monitoring, which has a certain impact on the test results.