A paternity test is the DNA analysis making it possible to determine the genetic relationship between an individual and his/her male parent.

Given that humans reproduce sexually, each individual inherits a copy of their mother’s genetic information and another copy from their father. The genetic paternity test is based on comparing the genetic information of the two.

A DNA analysis test is highly reliable however does not provide 100% certainty. The probability of certainty is related to the statistical probability of two individuals having the same DNA footprints, such as is the case, for example, of identical twins. The degree of certainty depends on how many markers are compared, which varies from one case to another, and what one is looking for or attempting to prove. This also depends on how frequent these same markers are in the population studied.

In the event of the alleged father not being available, a paternity index can be obtained by using samples from the paternal grandparents.

The following parameters are calculated for statistically determining the degree of accuracy of the test:

  • Paternity Index (PI): The PI shows the degree of likelihood that the Alleged Father is the biological father of the child in question in comparison to the likelihood of a random, unrelated man in the same population being the father.
  • Paternity Probability (W): Paternal probability (W) is the likelihood of certainty of our DNA test given in percentages, in other words, it is the likelihood that a given individual is the child of another individual on the basis of a likelihood equal, a priori, for all males in the population in question.

TRIO paternity/maternity test: Both parents and male/female child

This is the simplest of all the paternity/maternity tests, for which the different markers show a higher probability of exclusion, a priori, given that this is the case in which more information is available.

This test consists of calculating the probability as to the parents having had a male or female child of that certain genotype, calculating the favorable cases and dividing them by the number of possible combinations.

DUO paternity/maternity test: When one of the parents is not available for testing

In this case, the most practical approach is to calculate the paternity/maternity index by assuming that the unavailable parent is not in doubt.

Indirect paternal/maternal grandparent DNA grandparentage test

When samples of one of the parents are not available, the paternity/maternity test can be conducted using the DNA profiles of the paternal/maternal grandparents, in addition to the profile of the available parent. The statistical calculation makes it possible to calculate an index to a degree of accuracy comparable to that of the standard paternity/maternity test.

Post-mortem paternity/maternity test

This test may involve the exhumation of remains of the alleged father/mother. Long bones or teeth are preferably used for determining the DNA profile.

Given that the exhumation process can be lengthy and costly, we suggest that you ask us for an estimate and look into other options for having the test done.

Price: Paternity tests starting at 205 euros