Paternity DNA Testing – How It Works
The Technology of Paternity DNA Testing
Paternity testing is based on the Mendelian laws of inheritance. Each child has a unique DNA profile inherited equally from each parent.
Samples of material containing DNA taken from the mother, alleged father, and child are characterized. By comparing the DNA profile of the mother and the child, the maternal contribution to the child can be determined. The child’s DNA characteristics not found in the mother are the characteristics of the biological father.
The DNA characteristics of the biological father are then compared to the alleged father’s DNA profile. If the alleged father’s DNA profile does not match the profile of the biological father, paternity of the child by the alleged father is excluded. The biological father has not been identified. If the alleged father’s DNA profile matches the biological father’s profile, the findings are compatible with paternity. The Combined Paternity Index (CPI) represents the overall odds that an other random, untested male would have the same results if his genetic profile were compared with the child’s. The CPI is then converted into a Probability of Paternity value, which specifies the probability that the tested man is the biological father.
BRT Laboratories, Inc. often achieves a Probability of Paternity of at least 99.999% – indicating that there is only a minute, 0.0001% probability that another random individual in the population could have the same paternity test results and be the child’s father.