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Blood Donations and Blood
What is blood banking?
blood bank is a place where blood is collected and stored before it is used for
transfusions. Blood banking takes place in the lab. This is to make sure thet donated
blood and blood products are safe before they are used. Blood banking also determines
the blood type. The blood is also tested for infectious diseases.
Facts about blood banking
According to the American Red Cross:
About 36,000 units of blood are needed every day.
The number of blood units donated is about 13.6 million a year.
About 6.8 million volunteers are blood donors each year.
Each unit of blood is broken down into components. These are red blood cells,
plasma, cryoprecipitated AHF (cryo), a white blood cell called a granulocyte, and
platelets. One unit of whole blood and its parts may be transfused to several
people. Each person may have a different need.
More than 21 million blood components are transfused each year.
Who are the blood donors?
blood donors are volunteers. But you may also donate blood several weeks before having
surgery. This is so that your blood is available in case you need a transfusion.
Donating blood for yourself is called an autologous donation.
Volunteer blood donors must meet
certain criteria. These include:
Must be at least 16 years of age, or the minimum
age set by state law
Must be in good health
Must weigh at least 110 pounds
Must pass the physical and health history exam
given before donation
states let people younger than 16 or 17 years to donate blood, with parental
What tests are done in blood banking?
Certain standard tests are done in the lab once blood is donated. These include:
Typing. This is blood type. Blood can be A, B, AB, or O.
Rh typing. This can be Rh positive or Rh negative.
Screening for any unexpected red blood cell antibodies. These antibodies may
cause problems in the person getting the blood
Screening for current or past infections. The list includes:
Blood cells are treated with radiation. This kills any T-lymphocytes in the donated
blood. T-lymphocytes can cause a reaction when transfused. They can also cause
graft-versus-host problems. This is a rare complication of a blood transfusion.
Blood may also be filtered to remove certain white blood cells called leukocytes
(leukocyte-reduced blood). These cells contain antibodies that can cause fevers in the
person getting the transfusion. After getting several transfusions, the person may be at
higher risk for a reaction.
What are the blood types?
According to the AABB, blood types make up the following portions of the U.S.
O Rh-positive - 39%
A Rh-positive - 30%
B Rh-positive - 9%
O Rh-negative - 9%
A Rh-negative - 6%
AB Rh-positive - 4%
B Rh-negative - 2%
AB Rh-negative - 1%
What are the components of blood?
Blood or one of its components may be transfused. Each component serves many
Red blood cells. These cells carry oxygen to the tissues in the body. They
are commonly used to treat anemia.
Platelets. They help the blood clot. They are used to treat leukemia and
other forms of cancer.
White blood cells. This is a type of white blood cell that helps fight
infection. It helps in the immune process.
Plasma. This is the watery, liquid part of the blood. Red blood cells,
white blood cells, and platelets are a part of this liquid. Plasma is needed to
carry the many parts of the blood through the bloodstream. Plasma serves many
function. It is generally transfused to replace blood-clotting proteins.
Cryoprecipitate AHF. The party of the plasma that contains clotting
factors that help control bleeding.
Albumin, immune globulins, and clotting-factors may also be separated and processed for
Online Medical Reviewer:
L Renee Watson MSN RN
Online Medical Reviewer:
Raymond Kent Turley BSN MSN RN
Date Last Reviewed:
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