Final answer:
The nurse should instruct the patient on how to mix regular insulin and NPH insulin in the same syringe.
Step-by-step explanation:
When mixing regular insulin and NPH insulin in the same syringe, the nurse should provide the following instructions to the patient:
- Draw the regular insulin into the syringe first, followed by the NPH insulin.
- Ensure the needle is inside the NPH insulin vial while withdrawing the NPH insulin.
- Avoid injecting air into the NPH insulin vial to prevent contamination.
By following these instructions, the patient can safely mix and administer the regular and NPH insulin together.