It's usual seven day supply has fallen to four.
The Irish Blood Transfusion Service says it's struggling to maintain blood stocks and is under pressure to fill clinics.
It usually holds a seven day stock of blood, however after the Bank Holiday weekend, the reserve fell to just four.
The IBTS was forced to import 390 units of blood from the UK after a shortage at the end of last year.
Regular donors who are contacted by text are being asked to book an appointment as soon as possible.
Clinics will be held in Durrow in Laois, Edenderry, Birr and Tullamore later this month.
Barry Doyle of the IBTS says this is the first time this year that blood stocks have dipped to this point:
Almost €446,000 Allocated To Midlands Community Centres And Clubhouses
Two People Killed In Offaly Following Fatal Crash
Midlands Family Takes On Ireland’s Fittest Family Challenge
5K Fundraiser To Support Motor Neurone Disease Association Takes Place In Westmeath
No Slowing Down With Age As Westmeath Bowlers Shine At 14th Annual National Bowls Competition
Woman Appears In Court Over €280k Cannabis Seizure In Midlands
Status Yellow Fog Warning Issued For Leinster, Munster And Galway
Call For More Public Toilets Across The Midlands And Beyond