The HSE's warning people to expect major disruption in hospitals over the next two days, due to a strike.
Up to 30,000 procedures won't go ahead today and tomorrow, and there'll be long delays in emergency departments.
2,100 medical scientists won't carry out routine lab services between 8am and 8pm on both days - in a pay dispute.
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Tony Canavan, the chief executive of the Saolta hospital group, says it'll have a very significant impact throughout the country:
