More than 40% of NHS investigations into patient complaints are not good enough, according to a review by the office of the health service ombudsman.
In a review of 150 cases into allegations of avoidable harm or death, it found failings in the handling of 61 complaints by NHS trusts in England.
The review looked at the quality of the investigations and the evidence relied on, as well as statements and records.
The government said it was working to create a "more open NHS culture".
Ombudsman Dame Julie Mellor will appear next week before the public administration select committee - which is looking into the issue of NHS complaints and clinical failure
http://www.bbc.co.uk/news/health-31168260