The Irish Blood Transfusion Service (IBTS) says current stocks of blood are at critically low levels.
It says current supplies are only enough for three days, which is just under half of what's needed for an average week.
The IBTS normally tries to have 7 days of stock at all times.
It says the shortage has been caused by extreme pressures faced by hospitals recently, which has led to higher demand for blood.
Paul McKinney, Director of Donor Services and Logistics at the IBTS, says we need as many donors as possible to attend donation clinics over the coming days.
”If you receive a text message from us, please respond to the number provided and make an appointment, RhD-negative donors can attend any clinic and they will be accommodated.
"We constantly need new donors and anybody interested in becoming a new donor should register their interest on our website (www.giveblood.ie) where you will also find all clinic locations/opening hours and all frequently asked questions."
Huge thanks to the 2800 blood donors who attended our clinics this week. Our hospitals are extremely busy & demand for blood is constant. Please continue to support us in the coming weeks. Our clinic locations can be found here https://t.co/lE8MXBI8G3 #Thankyou ❤️❤️❤️❤️🩸❤️🩸 pic.twitter.com/FyEVu9Idr7
— Giveblood (@Giveblood_ie) January 20, 2023