"Prior to the last state election Colin Barnett and the Liberal Party had an opportunity to tell the WA public what their plans were for managing government services and they said nothing," UnionsWA Secretary Simone McGurk said today.

"They deceived the public and said that they would improve services, not sell them off.

Areas at the new hospital open to the highest bidder include crucial work such as cleaning; sterilisation; linen; catering and waste services; maintenance; security; equipment services; transport; procurement; and clerical services.

"Efforts in the past to have private providers operate these services in public hospitals have been a failure.

"To do the same job that was done by government and as well as make a profit - something has to give, and it is invariably the quality of the job done," Simone McGurk said.

"Public opinion is unrelenting in its call for improved government health services. We are absolutely convinced that selling off these crucial tasks in a hospital will be at the expense of quality for WA health consumers."

WA's peak union body was responding to the announcement by the Minister for Health, Kim Hames, to call for expressions of interest for all non-clinical services at the new Fiona Stanley Hospital.