A client with chronic kidney disease (CKD) missed dialysis yesterday to attend a funeral. The client's spouse calls the home health nurse and reports that the client is lethargic and hard to arouse. Which instruction is most important for the nurse to provide?

A Apply the client's home oxygen. D Ensure that the client avoids salt intake for the rest of the day. B Take the client to the emergency department (ED). C Check for a thrill and bruit at the client's dialysis access site.