Which of the following is a type of telehealth

Privacy filters are physical devices used to protect information on screens from unauthorized viewing. While they may be relevant to telehealth practices by enhancing patient privacy during remote consultations, they do not themselves constitute a form of telehealth.

A patient portal is an online platform that allows patients to access their health information, communicate with healthcare providers, and manage appointments. Although it facilitates communication and access to health data, it is more of a supportive tool rather than a direct type of telehealth like remote patient monitoring.

Email correspondence serves as a method of communication between healthcare providers and patients but lacks the interactive and real-time monitoring capabilities inherent to telehealth services. It does not utilize monitoring technology to track health data or conditions, which is key to defining telehealth.