More buildings on the Ashburton Hospital site may end up closed due to quake risk.
The operating theatre block, dating back to the 1920's, was closed yesterday after a report highlighted a high risk of collapse.
Two other building have already been closed after failing detailed engineering evaluations.
Canterbury District Health Board CEO David Meates says they're waiting for engineering assessments on other buildings including hospital wards.
"And it is likely that there could well be some further earthquake-prone buildings that may be identified through that process,'' he says.