What should be expressed as part of the concluding remarks in a letter?

The choice of including a polite request for action required in the concluding remarks of a letter is essential in professional communication, especially in a healthcare context. The conclusion should clearly articulate what the recipient needs to do next or what specific actions are required on their part. This clarity not only facilitates effective communication but also ensures that the recipient understands the importance of their response or intervention.

In a healthcare setting, explicitly stating the needed action helps to drive appropriate patient care decisions and enhances collaboration among healthcare providers. The reader is left with a clear direction, which is crucial in follow-up treatments or evaluations.

The other options, while relevant to the patient's situation, do not serve as actionable requests. They provide information about the patient's condition but do not directly prompt the reader to take a specific action, which is why they are less suitable for concluding remarks. Thus, the inclusion of a polite request for action required is the most appropriate choice for concluding remarks in a letter.