In addition to what has been said on this i want to add that there is what is called Rh Incompatibility/Isoimmunization-a Rhesus Negative woman getting pregnant for a Rhesus Positive Man;if the foetus inherits the Rhesus Positive blood factor from the father, the Rh- blood of the mother can be sensitized to develop antibodies against the Rh+ factor of the Rh+ blood. The 1st pregnancy MAY escape unhurt, but subsequent pregnancy that has Rh+ blood will be at risk of massive destruction of reb blood cells with resultant intruterine death if the mother was not given Anti D injection after the first baby. Rh- woman can marry Rh+ man she will need to be given Anti D injection after delivery of first pregnacy within 72 hours. There are tets to know the Rh status of the baby in the womb. If the baby is Rh- like the mother , the mother will not need any anti D injection after delivery-Dr Akinwilly

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:    

1. O+
2. A+
3. B+
4. AB+

5. O-
6. A-
7. B-
8. AB-

 
Can be given to patients with type:   

1. O+, A+, B+, AB+
2. A+, AB+
3. B+, AB+
4. AB+

5. O+, A+, B+, AB+, O-, A-, B-, AB-
6. A+, AB+, A-, AB-
7. B+, AB+, B-, AB-
8. AB+, AB-
Patients with Type:    (please follow the link the numbers together..)

1. O+
2. A+
3. B+
4. AB+

5. O-
6 A-
7. B-
8. AB-
   
Can receive type:
1.O+, O-
2.O+, A+, O-, A-
3. O+, B+, O-, B-
4. O+, A+, B+, AB+, O-, A-, B-, AB-

5. O-
6. O-, A-
7. O-, B-
8. O-, A-, B-, AB-

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