What are the differences between the various EHRs?

Electronic medical records (EMRs) are a digital version of the paper charts in the clinician's office. An EMR contains the medical and treatment history of the patients in one practice. EMRs have advantages over paper records. But the information im EMRs doesn't travel easily out of the practice. In fact, the patients record might even have to be printed out and delivered by mail to specialist and other members of the care team.