Final answer:
Professional duty begins once an express or implied therapeutic contract is established between a healthcare provider and a client. An express contract is clearly defined, often in writing, while an implied contract is understood through the actions of the parties.
Step-by-step explanation:
Professional duty begins as soon as the client enters into an express or implied therapeutic contract. When healthcare providers engage with clients, they are entering into a professional relationship that is guided by ethical codes and legal obligations. An express contract is a clear, explicit agreement between the client and the professional, often in written form, detailing the services to be provided and the expectations of both parties.
On the other hand, an implied contract is formed through the actions or conduct of the parties involved, signalling an unspoken understanding that professional services will be rendered.
The existence of a contractual relationship, whether express or implied, requires professionals to act with respect to their clients' rights, confidentiality, and to provide a standard of care that is consistent with their professional duties.