Final answer:
The nurse should tell the client to notify the doctor immediately if the dialysate returns become cloudy in appearance, the return of the dialysate is slower than usual, or a feeling of fullness is felt when the dialysate is instilled.
Step-by-step explanation:
The nurse should tell the client to notify the doctor immediately if the dialysate returns become cloudy in appearance, as this may indicate an infection or peritonitis. Additionally, if the return of the dialysate is slower than usual, it could indicate a problem with the peritoneal catheter or blockage. The client should also notify the doctor if they experience a feeling of fullness when the dialysate is instilled, as it could indicate fluid overload.