An appeal has been launched for O blood-type donors to book appointments across the country following the ransomware attack affecting major London hospitals.
NHS Blood and Transplant is appealing for O blood-type donors to book appointments to donate as this is safe to use for all patients.
The IT attack means the affected hospitals cannot currently match patients' blood at the same frequency as usual.
Several London hospitals declared a critical incident, cancelled operations and tests, and were unable to carry out blood transfusions last week after the attack on the pathology firm Synnovis, which Qilin, a Russian group of cyber criminals, is understood to have been behind.