The Ordered By field is used to describe who the order is being placed by. This may not always be the staff member who physically enters the order, such as a nurse putting in a surgery order on behalf of a provider. There is a user setting available to assist in defaulting this for individuals.
Once the order has been placed, the Ordered By cannot be changed. This ensures that orders expecting a result have an appropriate user to route the result for review.
The Ordered By field may also be used within the My Task - Orders to sort this list by this value, this is done in the Arrange By selection.