urine electrolyte analysis urine potassium analysis 2013-11-13T11:19:49Z 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. JSmith MMO:0000435 measurement_method_ontology urine K+ analysis urine potassium ion analysis