1. Select the parents' blood type:
2. Press "calculate", and wait for your result.
The blood type of the child must be: ...
Rhesus factor "+" or "-" ?
In certain cases, it is also possible to exclude paternity using the Rhesus factor: If both parents are rhesus factor negative (A-, B-, AB- or O-), the child must also be Rhesus factor negative. In all other cases, the child can either be Rhesus factor positive or negative.
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