You need to be hospitalized.你需要住院。

A:I guess you should know that you need to be hospitalized.

我想你应该知道你需要住院。
B:Of course I know.
我当然知道。
A:Now you can go to the in-patient department to go through the admission procedures.
现在你可以去住院部办理住院手续了。
B:Ok,I'll go right now.By the way,do you think it'll have to stay in the hospital for long?
好的，我马上就去办理。顺便问一下，你认为我需要住院很久吗？
A:It's hard to say.It depends on your recovery condition.But you need to stay for at least one day for observation.
很难说，这得看你的恢复情况了。不过你至少需要住院观察一天。
B:Thank you,doctor.
谢谢你，医生。