Which of the following best defines malpractice?

Malpractice is best defined as improper or unethical conduct by a professional, particularly in the context of healthcare. This definition encompasses situations where a healthcare provider fails to meet the standards of care required in their profession, leading to harm or injury to a patient. With malpractice, the focus is on the actions or omissions of the professional that fall below the accepted norm, demonstrating a lack of skill, knowledge, or ethical practice that directly affects patient outcomes.

The other options do not accurately encapsulate the concept of malpractice. For instance, high-quality patient care refers to the desired outcome of healthcare practices, rather than the failure that defines malpractice. A standard practice in patient management speaks to accepted protocols and guidelines in healthcare, which, when followed, would typically lead to the prevention of malpractice. A loose interpretation of legal requirements could suggest negligence but lacks the focus on the professional's conduct that is central to the definition of malpractice. Thus, the emphasis on improper or unethical conduct directly relates to malpractice, making it the most appropriate choice.