John, a 78 year old male patient in a hospital is referred to a pulmonary specialist for a consult on his breathing problems. the specialist orders a ct scan of the lungs and is alerted by the ehr that a ct scan was performed 1 week ago. this alert is designed to prevent duplicate testing and is part of which essential ehr component?

Decision support system.

Explanation:

EHR is the digital record of a person's health information. This record is designed so that it can be shared with all providers involved in patient care. The EHR contains all health records of the data subject. These records can be easily accessed and used by the same person to help make treatment and medical decisions. For this reason, we can say that in the case of the above question, when the EHR reported that the patient had already done a CT scan, he was running his decision support system to expedite the diagnosis and treatment of the patient.

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