The National Screening Service has said that "the challenge of staff recruitment and retention" could impact its aim to return to a biennial BreastCheck screening programme by autumn of next year.
Almost 90,000 BreastCheck screenings were carried out in the first six months of this year, according to the latest figures.
This is an almost 50% increase on the number of screenings carried out in the same period in 2021.
The service was interrupted for several months in 2020 and 2021 by the Covid-19 pandemic.
In a statement to RTÉ News, the National Screening Service said: "We aim to be back to two-yearly screens by autumn 2023.
"This is dependent on meeting the challenge of staff recruitment and retention."
BreastCheck said that it is "actively recruiting radiology and radiography staff to increase capacity for breast screening".
It has also opened three additional breast screening units.
A total of 88,767 BreastCheck screenings were carried out between January and July of this year, compared with 59,883 performed in the same period in 2021.
The total number of BreastCheck screenings for 2021 was 127,288.
In 2020, just 56,270 screenings were carried out during the whole year.
The European Cancer Organisation estimates that more than one million cancer screenings in Europe did not take place during the pandemic.
Irish Cancer Society Chief Executive Averil Power said it is "essential" that adequate resources are provided to ensure a return to a two-yearly screening programme.
"Screening is a valuable tool that helps to catch cancers at the earliest possible stage when treatment works best, so it is incredibly important that our screening services can return to a level of service that is at or above pre-pandemic levels.
"We know healthcare staff are working extremely hard to screen as many people as possible after a lengthy period of disruption, and it is encouraging to see that the numbers of people being screened for breast cancer appear to be returning to pre-pandemic levels.
"However, it is essential that adequate resources are made available by the Government to ensure that we are in a position to return to a two-yearly screening programme."
She added: "It is also important that the National Screening Service has guaranteed hospital capacity further downstream so that people can be diagnosed and treated in a timely manner.
"This should include the significant expansion and resourcing of symptomatic services so that they are equipped to meet current and future demand.
"Lastly the Irish Cancer Society strongly encourages people to attend their screening appointment when they're invited, and while people are waiting to be called, we urge them to remain aware of their health and any changes in their body."
