The Health Service Executive has for the first time published detailed performance figures of 29 of its acute public hospitals around the country.
Read the HealthStat report for your local hospital
The HealthStat information system shows that Mayo General Hospital, Castlebar, is the poorest performing hospital, ranked against 22 standards, including waiting times for operations, routine diagnostic tests and accident and emergency services.
The other poorly performing hospitals are Cork University Hospital and Our Lady of Lourdes Hospital, Drogheda.
All of these hospitals received an overall rating of red, indicating they were 'unsatisfactory and requiring attention' and well outside the national target.
All 29 hospitals were given either a green, amber or red rating overall.
The best performing hospitals were St Vincent's University Hospital, Elm Park, Mallow General Hospital and the Midland Regional Hospital Mullingar, which all received an amber rating or slightly better.
While no hospital received the overall rating of green indicating 'good performance', 26 received an amber rating indicating 'average performance' against the national target.
However among this group, Tallaght Hospital and Galway University Hospital received a red rating under the heading of access to services.
The detailed reports also reveal waiting times for outpatient clinics, physiotherapy, the amount of private work being performed as well as staff absenteeism rates.
The HSE plans to extend the monthly monitoring system to its remaining general and specialised hospitals this year and next year to community health and social care services.
Figures will be updated every month and will eventually be used to help make decisions on how hospitals are funded.
The HealthStat system examines service performance but does not reflect clinical care.
Reacting to today’s report, General Manager of Mayo General Hospital Tony Canavan said he accepted there were problems at its Accident and Emergency Department which need to be resolved.
He said considerable progress had been made over the past three years, but Mayo General has not been as successful in eliminating waiting times as other hospitals throughout the country.
He said he believed the situation would be much better by the end of the year and added that the report had also pointed out some very positive things about the services being delivered by Mayo General.