Final answer:
The nurse should discard the discontinued materials in a biohazard waste bin.
Step-by-step explanation:
The nurse should discard the discontinued materials in a biohazard waste bin. When a client receiving parenteral nutrition (PN) develops a fever, it can indicate the presence of an infection. Changing the solution and tubing is an initial step to prevent further contamination, and discarding the materials in a biohazard waste bin ensures proper disposal of potentially infectious materials.