You need to be hospitalized.你需要住院。
A:I guess you should know that you need to be hospitalized.
B:Of course I know.
A:Now you can go to the in-patient department to go through the admission procedures.
B:Ok,I'll go right now.By the way,do you think it'll have to stay in the hospital for long?
A:It's hard to say.It depends on your recovery condition.But you need to stay for at least one day for observation.