Paternity Test Process : Why Test the Mother? : Case Study, Part 1
In some cases, the matches between an alleged father and child provide an inconclusive result. In such instances, IDENTIGENE requests DNA samples for the biological mother. If she is unavailable, the test result remains inconclusive. With the mother, DNA paternity testing almost always provides a strong, conclusive result.
For example, consider the following case:
| Locus | Biological Mother (not tested) |
Alleged Father | Child | Parentage Index |
|---|---|---|---|---|
| D2S1338 | -- | 12, 13 | 10,12 | 1.845 |
| D2S1358 | -- | 8,11 | 11, 14 | 2.714 |
| D8S1179 | -- | 21.2, 32 | 19, 21.2 | 2.675 |
| D19S433 | -- | 15, 18 | 12, 15 | 7.338 |
In this case, the probability of paternity is 98.2896% (the product of all the parentage indexes). The result is inconclusive (because it must be greater than 99% or be exaclty 0%), yet the alleged father and child match at all locations. But, what happens if we add the biological mother's sample to the DNA paternity test?
