Blood Type Calculator
Determine possible child blood types based on parent genetics
Parent Blood Types
Select the mother's ABO and Rh blood type
Select the father's ABO and Rh blood type
Possible Child Blood Types
Population frequency: 2%
Population frequency: 30%
Population frequency: 8%
Population frequency: 35%
Population frequency: 1%
Population frequency: 8%
Population frequency: 2%
Population frequency: 13%
Most Likely Blood Type
AB+ with a 52.7% probability
Genetic Inheritance
Mother (A+): Possible genotypes - ABO: AA, AO, Rh: ++, +-
Father (B+): Possible genotypes - ABO: BB, BO, Rh: ++, +-
Each child inherits one allele from each parent for both ABO and Rh systems
Important Note
This calculator provides genetic probabilities only. Actual blood type must be determined by laboratory testing. In rare cases, genetic variations may affect results.
Blood Donation Compatibility
Universal Donor
O- can donate to all blood types
Universal Recipient
AB+ can receive from all blood types
Compatibility Rules
ABO System: Can only receive compatible ABO types
Rh System: Rh- can receive Rh- only, Rh+ can receive both
Donation: Must match recipient's compatibility requirements
Example Compatibility
A+
Can receive from:
O-, O+, A-, A+
Can donate to:
A+, AB+
B-
Can receive from:
O-, B-
Can donate to:
B-, B+, AB-, AB+
AB+
Can receive from:
O-, O+, A-, A+, B-, B+, AB-, AB+
Can donate to:
AB+
O-
Can receive from:
O-
Can donate to:
O-, O+, A-, A+, B-, B+, AB-, AB+
Population Frequency
Genetics Quick Guide
ABO System
A = AA or AO alleles
B = BB or BO alleles
AB = AB alleles
O = OO alleles
Rh System
Rh+ = ++ or +- alleles
Rh- = -- alleles
Rh- is recessive
Inheritance
Each parent contributes one allele for ABO and one for Rh to each child
Understanding Blood Type Inheritance
How Blood Types Work
Blood type is determined by the presence of specific antigens on red blood cells and antibodies in the plasma. The ABO system (A, B, AB, O) and Rh system (+, -) are the most clinically important for transfusions and pregnancy.
Genetic Inheritance Patterns
- •Dominant Alleles: A and B alleles are co-dominant
- •Recessive Alleles: O and Rh- are recessive
- •Independent Inheritance: ABO and Rh systems inherit independently
- •Mendel's Laws: Follows standard genetic inheritance patterns
Clinical Significance
Blood Transfusions
Incompatible blood types can cause serious immune reactions during transfusions.
Pregnancy Complications
Rh incompatibility between mother and baby can cause hemolytic disease of the newborn.
Organ Transplantation
ABO compatibility is crucial for successful organ transplantation.
Paternity Testing
Blood types can help exclude paternity but cannot definitively prove it.
Important Medical Considerations
Laboratory Testing Required
This calculator provides genetic probabilities only. Actual blood type must always be determined by proper laboratory testing before any medical procedures.
Rare Blood Types
Some individuals may have rare blood types or genetic variations not covered by standard ABO/Rh testing that can affect inheritance patterns.
Pregnancy Planning
Rh-negative mothers may need special monitoring and treatment during pregnancy if the father is Rh-positive to prevent complications.
Emergency Situations
In emergencies, O-negative blood can be given to anyone, but type-specific blood is always preferred when time permits proper testing.