A 53-year-old female asked:
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Is a peternity blood test taken 22 yrs ago as effective as a DNA test today?

1 doctor answer
Dr. Carin Van Gelder
24 years experience in Emergency Medicine
No.: Blood testing just looks at blood type, and while a child's blood type has to come from two specific blood types, many people have the same blood type (ie many options would still exist for the father). Today's dna testing uses cheek swabs and establishes a more exact dna pattern - different companies tout different success rates but most are >98%.
Answered on Mar 13, 2012
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