Patients across the country, whose important medical appointments have been cancelled tomorrow or later next week, are waiting to hear when they will be rescheduled.
The disruption has been caused by the cyber attack on the Health Service Executive computer systems on Friday. People with radiotherapy, X-ray and MRI appointments are among those affected.
Both chemotherapy and dialysis services are continuing. Hospital emergency departments remain open. Appointments for vaccination against coronavirus are going ahead.
The HSE says that anyone who has an appointment for a Covid-19 test should attend as planned but there could be delays with test results.