X Chromosome Test

When should you choose the X Chromosome Test?

The X Chromosome Test should be chosen when the people to test should share one X chromosome.

For example, if two alleged half-sisters (different mothers) want to verify if they share the same father, they should opt for the X Chromosome Test. The reason why they must have different, unrelated mothers is the way the X chromosome is inherited: if two women have one X chromosome in common, it would be impossible to know whether it comes from the father or from the mother's side.

If two alleged sisters with the same biological mother want to know if they share the same father, they will have to send the mother's sample in order to do the X Chromosome Test.

This analysis is not limited for test between sisters, as it is also the best option for a test between paternal grandmother and granddaughter.

How is the X chromosome inherited?

Inheritance of the X chromosome

Men have one X chromosome and one Y chromosome, while women have two X chromosomes (and no Y chromosome).

Men inherit their X chromosome from their mother. Women inherit one from the father and one from the mother.

Therefore, the X Chromosome Test can be useful to verify different relationships, on both the paternal and the maternal side.

* In order to simplify this picture, both of the grandmother's X chromosomes have been represented using the same colour. However, these chromosomes are different from one another.


X Chromosome Test  299 € 99,9% accurate


The price indicated above is the final price for the analysis of 2 people with standard samples. If the mother's sample is needed, it will be tested at no additional cost (for 1 mother, standard sample).

If you are unsure about whether this test is the best testing option for your case, please contact us. Please remember that, if there is a blood relationship between the fathers/mothers, this analysis may not be the adequate procedure for you; please, contact us before ordering your kit.


Buy Now
Recorded Delivery Shipping Included
Order Kit for 9€
Pay the remainder later

You have 2 purchase options:

  • Pay for the complete test now and receive the kit by recorded delivery mail at no extra charge. The kit is sent with a tracking number and delivered upon signature.
  • Pay only a 9€ deposit (deductable from the test price), and receive the kit by normal post. Pay the remainder when you send in your samples.
Take a relationship test in 4 simple steps:
  1. Place your order.
  2. Receive your sample collection kit and collect the samples. Easy and detailed instructions on how to collect the DNA samples are included with the paperwork.
  3. Send to us the DNA samples, paperwork and remaining payment (if any).
  4. Receive your test results in 15-20 working days.
Order Kit for 9€
Pay the remainder later
Can't send a mouth swab?

Paternidad-discretaWe can accept other samples for testing like nail clippings, hairs, blood, etc. Check the information on the non-standard samples we can accept here.

Can't wait for the kit to arrive? Paternidad-discreta

Request the paperwork by email and follow the instructions to collect the samples with cotton buds. Request the paperwork here.

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