Less than 5% of the population makes use of Web-based personal health records, according to research. In part, that is due to privacy and confidentiality concerns and in part because so few physicians use EHRs to which they can upload data. Currently, the most active PHRs are those that link to and mirror the electronic medical records of a health care provider, but some say an untethered model could give patients more power and options and provide the basis for regional and national health information exchanges.

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