Midlands Regional Hospital.
A Ransomware cyber attack was launched on the computer system at the lab in Tullamore hospital this week.
The Windows Ransomware attack took place on Wednesday and was directed at the Laboratory Information System and associated IT infrastructure.
The hospital says it has been assured that this is an isolated incident and there is 'no evidence of contagion beyond the initial attack'.
Since the attack, the hospital has been working in conjunction with the HSE Office of the Chief Information Officer to restore the system and reinstate a functional LIS within a reconfigured secure HSE environment.
The hospital has stressed that there has been 'no impact on patient care' and business continuity plans are in operation until the full system is restored.
The HSE has informed the Data Protection Commission on a precautionary basis.
Ransomware is a type of malicious software from cryptovirology that threatens to publish the victim's data or perpetually block access to it unless a ransom is paid.
Ransomware attacks are carried out using a Trojan that looks like a legitimate file when it arrives through email.
It is estimated that there have been 181.5 million ransomware attacks in the first six months of 2018.