United Blood Services
United Blood Services HomeAbout UsDonate BloodFor our hospital customersBlood Drive CoordinatorsFor students & teachersDonate MoneyEmployment

Human Blood Types

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, 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. Check the chart below to see what percentage of the population shares your ABO grouping.


O + 37% O- 6%
A+ 34% A- 6%
B+ 10% B- 2%
AB+ 4% AB- 1%

When you donate, United Blood Services will send you a card with your blood type. Whatever type you are, someone in the community can benefit from your blood donation. Donate today. You’ll feel terrific!

Possible Blood Transfusion Combinations

Type: Can be given to patients with type:

O+
A+
B+
AB+

O-
A-
B-
AB-

 

O+, A+, B+, AB+
A+, AB+
B+, AB+
AB+

O+, A+, B+, AB+, O-, A-, B-, AB-
A+, AB+, A-, AB-
B+, AB+, B-, AB-
AB+, AB-
Patients with Type: Can receive type:

O+
A+
B+
AB+

O-
A-
B-
AB-

O+, O-
O+, A+, O-, A-
O+, B+, O-, B-
O+, A+, B+, AB+, O-, A-, B-, AB-

O-
O-, A-
O-, B-
O-, A-, B-, AB-

 

 

 

 

 
Find out how and where to donate blood.
HOME  |  DONATE BLOOD  |  EMPLOYMENT  |  PRIVACY POLICY | CONTACT US