automated urine analysis urine sodium analysis automated urine sodium analysis 2014-01-14T12:30:48Z JSmith MMO:0000456 Method using a device designed to follow a predetermined sequence of individual operations repeatedly and essentially without external influence or control to assess the amount, proportions or properties of sodium in urine, the fluid waste product excreted by the kidneys. Sodium, the chemical element with atomic number 11 that in its ionic form has lost one electron, forming a cation with a charge of +1, is the chief cation of extracellular body fluids. automated urine Na+ analysis automated urine sodium ion analysis measurement_method_ontology