Blood Types

Blood Group	Antigen
A	Has only A antigen on red cells (and B antibody in the plasma)
B	Has only B antigen on red cells (and A antibody in the plasma)
AB	Has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
O	Has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)

Compatible Blood Type Donors

Blood Type	Donate Blood To	Receive Blood From
A+	A+ AB+	A+ A- O+ O-
O+	O+ A+ B+ AB+	O+ O-
B+	B+ AB+	B+ B- O+ O-
AB+	AB+	Everyone
A-	A+ A- AB+ AB-	A- O-
O-	Everyone	O-
B-	B+ B- AB+ AB-	B- O-
AB-	AB+ AB-	AB- A- B- O-

It is important to note that in addition to the ABO blood group system, there is also the Rh factor (positive or negative), which further classifies blood types. For example, someone with A+ blood type has A antigens and the Rh factor present on their red blood cells.

Knowing your blood type is essential for blood transfusions, organ transplants, and in case of medical emergencies. If you are unsure of your blood type, you can consult with a healthcare professional for testing.

Possible Blood Type of a Child According to Their Parents Blood Group

Blood Type Child Parental

Parent 1		AB	AB	AB	AB	B	A	A	O	O	O
Parent 2		AB	B	A	O	B	B	A	B	A	O
O						x	x	x	x	x	x
A		x	x	x	x		x	x		x
B		x	x	x	x	x	x		x
AB		x	x	x			x

The above describes the following

If both parents have blood type A:

Child can have blood type A (AA) if both parents pass on the A allele.

Child can have blood type O (AO) if one parent passes on the A allele and the other parent passes on the O allele.

If both parents have blood type B:

Child can have blood type B (BB) if both parents pass on the B allele.

Child can have blood type O (BO) if one parent passes on the B allele and the other parent passes on the O allele.

If one parent has blood type A and the other parent has blood type B:

Child can have blood type A (AB) if one parent passes on the A allele and the other parent passes on the B allele.

Child can have blood type B (AB) if one parent passes on the B allele and the other parent passes on the A allele.

If one parent has blood type A and the other parent has blood type O:

Child can have blood type A (AO) if one parent passes on the A allele and the other parent passes on the O allele.

Child can have blood type O (OO) if both parents pass on the O allele.

If one parent has blood type B and the other parent has blood type O:

Child can have blood type B (BO) if one parent passes on the B allele and the other parent passes on the O allele.

Child can have blood type O (OO) if both parents pass on the O allele.

If both parents have blood type AB:

Child can have blood type A (AB) if one parent passes on the A allele and the other parent passes on the B allele.

Child can have blood type B (AB) if one parent passes on the B allele and the other parent passes on the A allele.

Child can have blood type AB (AB) if both parents pass on the A and B alleles.

If one parent has blood type AB and the other parent has blood type O:

Child can have blood type A (AO) if one parent passes on the A allele and the other parent passes on the O allele.

Child can have blood type B (BO) if one parent passes on the B allele and the other parent passes on the O allele.

It is important to note that blood compatibility is crucial for safe blood transfusions. Receiving incompatible blood can lead to serious health complications, including a potentially life-threatening reaction. Healthcare professionals carefully match blood types between donors and recipients to ensure compatibility and safety during transfusions.