The finding of urine sodium concentration <20 mmol/L in hypovolemic hyponatremia implies
Hypovolemic hyponatremia Urine sodium concentration >20 mmol/L Renal losses Diuretic excess Mineral coicoid deficiency Salt-losing deficiency Bicarbonaturia with Renal tubal acidosis and Metabolic alkalosis Ketonuria Osmotic diuresis Cerebral salt wasting syndrome Urine sodium concentration <20 mmol/L Extrarenal losses Vomiting Diarrhea Third spacing of fluids Burns Pancreatitis Trauma Ref: Harrison 19e pg: 299
Salt-wasting nephropathy
Diuretic therapy
Hypoaldosteronism
Trauma
Fluid and electrolytes