There are only 3 days supply, and the optimal is 7.
Hospitals may have to start cancelling surgeries if there isn't an increase in people giving blood over the coming weeks.
The Irish Blood Transfusion Service says there's currently 3 days of stock - compared to the usual 7 days' worth.
IBTS has launched an urgent appeal today to donors as supplies are very low, it's vital eligible texted donors make an appt to attend this week’s clinics to meet hospital demand. Visit https://t.co/ijLZ3m9PoT for your local clinic details, check eligibility or reg your interest🩸 pic.twitter.com/PfHgqJ6UCA— Giveblood (@Giveblood_ie) October 26, 2021
It's asking donors to book appointments to give blood to help get supplies back to normal levels.
Information on clinic dates, times and locations throughout Ireland is available here.
Stephen Cousins is IBTS National Donor Services Manager.
He joined Ciara Noble on Wednesday's edition of Kildare Today.