imagine being so irretrievably stupid & morbidly dense that you dont understand that EVERY single patient in a hospital, no matter the root cause, first passed through the ER on their way to whatever area the ER designated they should go.
Without prejudice to the earlier question, i.e., "is the ER a triage unit?" .... this statement ^ ^ ^ in which the emphasis is yours, is simply FALSE. To your credit, I don't think you are trolling here, but rather, simply ignorant AF.
People enter the hospital in many instances through the front door, check in, and proceed directly to their beds.