urine electrolyte analysis urine potassium analysis urine potassium ion analysis A method which assesses the amount, proportions or properties of potassium in urine, the fluid waste product excreted by the kidneys. Potassium, the chemical element with atomic number 19 that in its ionic form has lost one electron, forming a cation with a charge of +1, is the chief cation of intracellular fluid. measurement_method_ontology urine K+ analysis MMO:0000435 2013-11-13T11:19:49Z JSmith