An appeal is going out to O Rh negative (O-) and B Rh negative (B-) blood donors to come forward.
We would like to reassure everyone that blood stocks are not low and patient care has not been affected in any way.
Donors with blood group O Rh negative are typically known as the "universal donor" as their blood can be given to patients with a different blood group. This can prove vital in an emergency situation when there may not be time for an immediate blood grouping test to be carried out. Approximately 7% of the population have this blood group.
Donors with the blood group B Rh negative are more often found in Black and Minority Ethnic (BME) communities. Only 2% of the population have this blood group and more donors of a BME origin are particularly needed.
To be potentially eligible to give blood you must be aged between 17 - 65, weigh over 7st 12lbs (50kg) and be in general good health. There is no upper age limit for blood donation if you have donated in the last two years.
More about Blood Donation:
Every year the lives of thousands of people are saved or transformed through organ transplantation. Join the register.
Platelet donations are often life-saving. Have you given blood before? You may be able to donate platelets. more about Platelet Donation.
The British Bone Marrow Registry is a division of NHS Blood and Transplant. more about BBMR.
Tissue donation gives many families the option of making a difference to others. more about Tissue.
In creating one life why not save another? Are you pregnant and live in North London? You may be able to donate cord blood. more about Cord Blood.