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Blood is grouped into four types: A, B, AB, and O. Each Type is also classified by an Rh factor: Either positive (+) or negative (-).

When a blood transfusion is necessary, blood donor and patient blood must be compatible. If not, the patient’s body will react to the incompatible donor cells, leading to complications, maybe even death. Your ABO blood grouping and Rh factor are inherited from your parents.

Following are the Blood Groups Blood Group O (Universal Donor)
O Negative
As an O negative donor, we have a great need for your whole blood donations. This type is uncommon – only 6 percent of the population is O negative. O negative patients should receive blood only from O negative donors.
People with every other blood type can safely be transfused with O negative blood. This is usually done in an extreme emergency, before their own blood types can be determined.

O Positive
As an O positive whole donor, it is of great help in donation. This type is the most common – nearly 40 percent of the population is O positive. It is in greatest demand.