MedicineNephrologyPhysiologyExcretionMineral MetabolismRenal PathophysiologyChronic Kidney DiseaseElectrolyte HomeostasisPotassium HomeostasisRenal ExcretionSodium HomeostasisUrinary ExcretionChronic Renal InsufficiencyFractional Excretion Of SodiumRenal Mineral ExcretionUrinary Potassium ExcretionUrinary Sodium Excretion