Final answer:
The charge nurse assembled the entire healthcare team upon arrival to the ED in order to provide collaborative and comprehensive care to the client with traumatic amputation of the lower left arm, with the goal of maximizing their upper extremity function.
Step-by-step explanation:
The rationale for assembling the entire healthcare team upon arrival to the ED is that healthcare teams utilize collaborative delivery of high-quality, interdisciplinary health services in a shared leadership role, where accountability is both individual and mutual in nature. By having all members of the healthcare team present, it allows for comprehensive and coordinated care to be provided to the client with traumatic amputation of the lower left arm. Each member of the healthcare team brings their specific expertise and skills to the table, working together to optimize the client's recovery and upper extremity function.