urine sodium excretion rate urine sodium excretion rate to body weight ratio 2013-11-04T17:42:09Z A calculated measurement in which urine sodium excretion rate is divided by the total weight of the body, i.e., the heaviness or the degree to which the body of the organism is drawn toward the earth by gravity, 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:0001855 JSmith VT:0006274 clinical_measurement_ontology calculated urine electrolyte excretion rate