Paternal affirmation rate and paternal exclusion rate

The probability of a DNA test being ‘not the father’, i.e. the paternity exclusion rate, is usually more than 99.9% accurate; DNA testing is so reliable that if the alleged male father is in fact not the father, the conclusion is almost certain.

Specifically, they include:

Paternity exclusion rate
Not the father: DNA testing can determine ‘not the father’ with a probability of 99.99% or more. This accuracy indicates a very low probability of paternity and effectively determines that he is ‘not the father’.
Paternity affirmation rate
If the man is the father: on the contrary, if the man is in fact the father, DNA testing usually confirms that the man is the father with a probability of 99.99% or higher. This high probability indicates that the man is almost certainly the father.
Reasons for the accuracy of the test
DNA testing is extremely accurate because DNA is based on genetic information shared between parents and children. In particular, paternity testing using STR (Short Tandem Repeat) markers determines paternity by confirming a match between the DNA of the child and that of the alleged father. If the genetic information that the father and the child would have shared does not match, the conclusion is almost certain that he is not the father.

Summary

The probability that a DNA test concludes that a person is ‘not the father’ is higher than 99.99%.For this reason, DNA testing is a very reliable method in confirming or denying paternity.