A client who has a serum potassium level of 5.9 mEq/L (5.9 mmol/L) tells the nurse of deciding to leave the hospital, even though the healthcare provider has not discharged the client. The client states, "I do not care if I am not discharged, I do not want any more treatment." It is most important for the nurse to ensure that the client understands which fact prior to leaving the facility? Reference range