The Irish Blood Transfusion Service has warned that its blood supplies are running dangerously low.
The group currently has just three-and-a-half days worth of blood in stock - half of the required amount.
It is launching an appeal for 15,000 donations over the next few weeks, to keep the hospitals in stock over Christmas.
Mobile blood donation clinics will be travelling around the country as part of the new campaign.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com