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Online care or an e-visit is a way of obtaining medical care for problems which do not require a physical examination and which do not require treatment beyond a prescription available online or diagnostic tests beyond blood tests. It is best if you are able to give the treating doctor online a complete medical history such as is possible with a service such as MDLiveCare (disclosure: I work for MDLiveCare as a consulting physician at times). Online visits can be conducted using a videocamera but the term is also used for visits carried out over the telephone when the history is online, and the doctor documents the visit online.
Online care is just like an office visit but without being physically in the same space. In some instances, online care is conducted solely by phone. In other instances, it is conducted via video link, either at a patient-friendly medical kiosk or from within a clinic or hospital. The essential feature is that the doctor and the patient are communicating about the patient's concerns, just as in any visit to a doctor in a physical location.
Online care is the the modern way for a patient to communicate with their physician utilizing technology. It is used for advise and the treatment of non-urgent medical conditions that do not require a physical exam.