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Blood Type Calculator
Predict possible blood types for your baby based on parental genetics. Understand ABO and Rh inheritance patterns.
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How Blood Type Inheritance Works
Blood type is determined by the ABO blood group system and the Rh factor. We inherit one gene from our mother and one from our father.
The ABO System
- Type A: Can have AA or AO genotype.
- Type B: Can have BB or BO genotype.
- Type AB: Has AB genotype (codominant).
- Type O: Has OO genotype (recessive).
⚠️ Common Mistake: Universal Donor
Many people think O+ is the universal donor. Actually, O Negative (O-) is the universal donor for red blood cells because it has no A, B, or Rh antigens to trigger an immune response.
The Rh Factor
The Rh factor is either positive (+) or negative (-). Rh+ is dominant, while Rh- is recessive.
- Rh+ Parent: Can be ++ or +-.
- Rh- Parent: Must be --.
💡 Expert Tip from Dr. Alex M.
For expectant mothers, knowing your Rh status is vital. If you are Rh- and your baby is Rh+, it can cause Rh incompatibility. Fortunately, this is easily managed with a shot called RhoGAM during pregnancy.
Frequently Asked Questions
What determines my baby's blood type?
Your baby's blood type is determined by the genes inherited from both parents. Each parent contributes one of two ABO alleles and one Rh factor allele.
Can two O type parents have a child with A or B blood type?
No. Type O parents only carry O alleles (OO). Therefore, they can only pass on O alleles, resulting in a child with Type O blood.
What is the universal donor blood type?
O Negative (O-) is considered the universal red blood cell donor because it lacks A, B, and Rh antigens, minimizing the risk of reaction.