The urine sodium test measures the amount of sodium excreted in urine. It helps evaluate fluid balance, kidney function, and the cause of abnormal blood sodium levels.
Category: Urinalysis
Also known as: urine sodium, sodium urine, urinary sodium, urine na
Reference range: 40–220 mEq/L (Source: ABIM)
Standard unit: mEq/L
High values may indicate
High urine sodium may indicate excessive salt intake, adrenal insufficiency, kidney disease (salt-wasting nephropathy), or diuretic use.
Low values may indicate
Low urine sodium may indicate dehydration, heart failure, liver cirrhosis, nephrotic syndrome, or aldosterone excess.