1930s - Serological Testing
 In the 1930s, scientists discovered other proteins in the blood that could be used for identifying humans. The Rh, Kell, and Duffy blood group systems, like the ABO system, were based on the presence of specific antigens in the blood. These antigens are also genetically inherited, proving useful in identifying possible biological relationships.
Through these serological tests, scientists could use the blood group systems of two parents to predict the possible blood group of their child. Scientists also applied serological testing to paternity cases, attempting to identify alleged fathers based on the blood groups of the child and mother. However, much like the use of the ABO system for paternity testing, serological tests are not conclusive in identifying biological parents. The power of exclusion for serological testing is only 40%, meaning this technique is not effective in identifying biological relationships.
Introduction to DNA Testing History
1920s >> Blood Typing
1930s >> Serological Testing
1970s >> HLA Testing
1980s >> DNA Testing Using RFLP Technique
1990s >> DNA Testing Using PCR Technology
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