FIFTY-ONE hospitals will be on limited service today as 3,000 junior doctors strike over working hours.
The move follows weeks of failed negotiations with the Health Service Executive (HSE) over shifts that run for more than 24 hours.
The Irish Medical Organisation has also threatened that this may not be the last walkout.
From 7am to midnight numbers of non-consultant hospital doctors will be down to Sunday levels with one additional on-call registrar for intensive care units.
It will be the first time in 25 years that doctors have gone on strike.
Doctors will carry out any required transplant and dialysis service and the normal weekend palliative care, attend for patients who are undergoing active chemotherapy and radiotherapy which cannot be deferred and any unforeseen major incident.
About 12,000 outpatient appointments have been cancelled as a result and about 3,000 operations have had to be postponed.