X Chromosome Test

This X-Chromosome test is useful in cases where two females wish to establish whether they share the same father. The test is straightforward when the two sisters have different mothers; thus, what they seek to determine is whether they are half siblings or no siblings at all. In this situation, we do not require testing the samples of the mothers. The test will map the X-chromosome pattern of the two alleged siblings and if there is a match then this will confirm they share the same father.

In cases where the alleged sisters share the same mother, then we will require the mother’s DNA sample to conclude the test. A female inherits an X chromosome from the father and an X chromosome from the mother. By identifying the mother’s DNA profiles, we can exclude her share of X chromosome from the test.

There may be cases in which half sisters are not able to provide the mother’s DNA sample. In this case, we cannot conclude the X-chromosome test. The only available option is for the alleged sisters to do a siblings STR test which will determine whether the biological relationship between them is strong enough to indicate they are full sisters.

The X-chromosome test is offered starting from £269.00 and this covers testing for two sisters. Your results will be sent to you by email in 7-14 working days. You can order your test now or read more on our DNA relationship Test page.