Can an inpatient be transferd from and floor to the emergency room?

I don't think it is a common practice but it could be warranted.

A patient being treated for example for an infection on a hospital floor could have a heart attack totally unrelated to the infection. If a qualified Dr. was not available on that floor or even poosble no Dr. available on that floor, it would certainly make sense to take the patient to the location where the Dr's and equipment were readily available to treat emergency conditions.