20% of NHS work does no good, says Welsh minister
16 January 2014 Last updated at 19:27 GMT
Up to a fifth of the NHS's work does not benefit patients and could cause harm, the health minister has said.
In a speech Mark Drakeford called on the Welsh health service to adopt a policy of "prudent medicine" prioritising resources on proven care.
It could mean surgery like tonsil removal may not be offered if it was considered of little benefit and antibiotics prescriptions could be cut.
It has led to criticism that the policy could see health services rationed.
BBC Wales health correspondent Owain Clarke reports.