A coroner has said "lives are being put at risk" by a health board delaying changes to diagnosis procedures.
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John Gittens was speaking at an inquest into the death of Kyle Hurst, 29, from Flint, who died at Glan Clwyd Hospital after taking a paracetamol overdose.
Mr Gittins, chief coroner for North Wales East and Central, said changes to prevent these deaths had not been made.
Mr Hurst died of multi- organ failure and the coroner recorded a conclusion of suicide.
"Time and time again I am left more than frustrated by their inability to act on what I am being told," Mr Gittens told the hearing.
In July, Mr Gittins issued a report on preventing future deaths to the Betsi Cadwaladr University Health Board after another woman died after taking a high level of paracetamol.
At that time he was told by Gill Harris, the board's executive director of nursing, that new procedures to speed up the diagnosis and communicating of life-threatening blood results would be in place by 1 October.
But at Friday's inquest he was told by Dr Tom O'Driscoll, a consultant in emergency medicine, that it was now hoped they would be implemented by Christmas, after receiving formal approval.
Dr O'Driscoll said although it was already possible for an antidote for a drugs overdose to be administered based on a suspected overdose, it had not yet been adopted by the health board.
"There are lives being put at risk by this health board not implementing what they said they would do in a timely manner," said Mr Gittens.