Final answer:
The patient’s medical history is the most appropriate tool for communicating continuity of care in a change-of-shift report.
Step-by-step explanation:
In preparing a change-of-shift report, the most appropriate tool or document for communicating continuity of care is the patient’s medical history. This document contains essential information about the patient's previous diagnoses, treatments, and medications, which is crucial for ensuring a seamless transition in care between healthcare providers.