The HSE is advising people who have received letters cancelling procedures and appointments tomorrow to ignore them.
It follows the deferral of planned industrial action by hospital staff.
Hospital services will now operate as normal tomorrow and the HSE is assuring patients that the original appointments stand.
"We will be seeking to reinstate as many procedures as possible, to ensure the impact on patients is kept to a minimum, and insofar as it is possible Thursday will operate as a normal day in the health services," a statement said.
Around 16,000 patients had either surgery or appointments postponned amid uncertainty over whether the proposed national strike was going ahead.
The HSE said that if any patient remains in doubt, they can ring the telephone number on their appointment letter.