Nearly 44 percent of office-based physicians used electronic health records (EHRs) in 2009, according to preliminary estimates by the Centers for Disease Control and Prevention (CDC). About 20 percent of office-based physicians reported having a "basic" EHR system, including patient demographic information, problem lists, clinical notes, prescription orders and viewing of lab and imaging results. Just over 6 percent reported having "fully functional" systems, which also send prescription and test orders; highlight out-of-range test levels; and provide patient medical history and follow-up information, drug interaction warnings and reminders for guideline-based interventions.

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