urine sodium excretion rate calculated urine electrolyte excretion rate urine sodium excretion rate to kidney weight ratio 2020-01-28T09:58:04Z A calculated measurement in which urine sodium excretion rate is divided by the weight of the kidneys, and presented as a ratio, fraction, quotient or percentage. Urine sodium excretion rate is the amount of sodium, the chemical element with atomic number 11, discharged in the urine, the fluid waste product separated and discharged by the kidneys, per unit time. CMO:0003375 clinical_measurement_ontology sjwang