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Paternity Testing and Blood Types 



Using the ABO and Rh blood systems for determination of paternity is not conclusive and absolute, it is only predictive at best.


The limitations of the ABO system are clear:  There are only four different blood types under this system, and two of these (A and O) are carried by a huge

majority of the population.  This clearly means that in many cases, even if the blood type of the father matches correctly, it does not provide any kind of proof that he is the father.


Another problem arises when mutations occur.  This is a rare thing to happen but it can.  This can mean that even if by checks on blood typing, paternity is discounted for an individual, then he may still be the father and the false conclusions are derived from the mutation.  It is for these reasons that we caution all readers to view this article as a guide only.


In most legal systems in the world, the main blood typing that is accepted as proof in a court of law is the HLA typing method (Human Leukocyte Antigen) the readings for which are taken from the white blood cells.  This method collects information from almost all of the proteins found on the surface of most human cells.


Apart from the ABO and Rh systems mentioned here, there are at least ten other different methods available for the typing of blood cells.  These allows forensic scientists much more accuracy when investigating inheritance and genealogy. 


1. What is a blood type? 

2. How blood types are inherited

3. The Rh blood type system - positive or negative

4. Paternity testing and blood types

5. Examples of blood type inheritance

6. A quick history lesson




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All information provided on this web site is for the purpose of education, information & discussion only and is not a replacement or substitute for consultations with your medical practitioner.  If you have ANY concerns about your health, please see your doctor immediately and do not rely solely on information found here or anywhere else on the internet.