Orders are usually for a particular patient, but they can also be for a department (e.g., floor stock) or for a non-patient (e.g., an environment study where no specific patient is involved.)
The transmission of clinical orders occurs between the application placing the order (the placer) and the clinical application filling the order (the filler).
Typically, the caregiver (e.g., physician) is entering orders on the HIS application which acts as the placer application in HL7 messaging parlance. The system to which the order is targeted (e.g., the lab in the case of a complete blood count order) is the filler of the order.
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