(Brief from WordIQ.com)
Blood donors and blood recipients must have compatible blood types. O- is the universally compatible blood type. The chart below illustrates how people with different blood types can receive or donate other blood (X means compatible). An A- person, for example, can receive either O- or A-, and can donate to people with AB+, AB-, A+ or A- blood.
In general, people with type O Rh- are referred to as universal donors, as their blood can be transfused to anyone in need. It is thus the most highly sought after blood type in blood banks and hospitals. A type AB Rh+ is referred to as a universal receiver because he or she can receive blood of any type.
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BLOOD COMPATIBILITY CHART
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Recipient
Donor
.
O-
O+
B-
B+
A-
A+
AB-
AB+
.
AB+
X
X
X
X
X
X
X
X
.
AB-
X
X
X
X
.
A+
X
X
X
X
.
A-
X
X
.
B+
X
X
X
X
.
B-
X
X
.
O+
X
X
.
O-
X
.
.
X
Denotes Compatible Donor Type. For example, an A-negative person cannot receive blood except from another A-negative person or from an O-negative person.
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O-
Universal Donor
.
AB+
Universal Receptor
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BLOOD TYPE DISTRIBUTION BY HUMAN POPULATION
.
Type
Frequency
.
O-
38%
.
O+
34%
.
B-
9%
.
B+
7%
.
A-
6%
.
A+
3%
.
AB-
2%
.
AB+
1%
.
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Note: There are also variations in blood-type distribution within human subpopulations.
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BloodType - Brief:
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A blood type is a description an individual's characteristics of red blood cells due to substances (carbohydrates and proteins) on the cell membrane. The two most important classifications to describe blood types in humans are ABO and Rh factor. There are 46 other known antigens, most of which are much rarer than ABO and Rh. Blood transfusions from incompatible groups can cause an immunological transfusion reaction, resulting in hemolytic anemia, renal failure, shock, and death.
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