I don't know if he has been to the hospital. He / really not need to, it wasn’t necessary and it might not have happened.
He really didn't need to.
He / go to hospital, but it wasn’t necessary. He was just making a huge fuss.
He needn't have gone to hospital.
There was no need for us to have arrived so early for the hospital appointment.
We needn't have arrived so early for the hospital appointment.