Canterbury District Health Board says all its services are operating normally after structural engineers have re-checked all hospital sites.
It says there is no damage that should concern the public.
Burwood hospital's birthing unit is open again.
The board says patients in oncology and neurosurgery wards at Christchurch hospital have been moved elsewhere in the hospital, but this is for patients' peace of mind rather than for safety reasons.
The emergency department is operating at normal levels and there are relatively few earthquake-related casualties.