Anyway....I'm not sure about ER, but in my case (orthopedics), we would basically consider a patient ready to discharge if they were ambulatory with minimal assistance, vital signs stable, bloodwork acceptable (specifically H&H), had adequate assistance and equipment arranged for at home, voiding OK, bowel movements OK, postop nausea & vomiting resolved, etc. Or a patient who needed rehab or extended care who had arrangements made and met the above criteria as much as possible for them.
So for these patients, we would call the doc and request a discharge order, letting him or her know that there were patients in the ER needing beds.
It's a tough question to answer, because it also depends on the patient's pre-hospital level of functioning, support systems at home, availability of rehab or extended care beds, patient's level of independence, and other factors.
What were the choices of answers?