Price and turnaround time

Our sibling DNA test starts at $299. The results are ready in 5-7 working days from receipt of samples at the laboratory.

Due to New York State Department of Health regulations, we cannot offer any peace of mind paternity or relationship tests to New York residents. However, we can offer legal paternity and relationship tests in New York. Contact us or click here for more information.

What can our siblings DNA test tell you?

Are you half sibling or full siblings? If you are half siblings you will share around half of your genetic material and share only one parent. If you are full siblings, then you will share the vast bulk of your genetic material and thus, share both biological parents.

Are you half siblings or unrelated? If you are unrelated you will have very little, if any, genetic material in common (Although you could have common genetic material by random chance as DNA between all individuals is similar to some degree or other).

We strongly suggest including the sample of a known mother to provide stronger results.

Sibling DNA testing to replace a parentage test

A siblings DNA test can be used in the place of paternity test.  This means that through this test we are establishing a genetic relationship between siblings and parent without testing the DNA of the parent concerned. If the alleged father is available for the test, we definitely suggest a home paternity test.

PLEASE NOTE: In the event of a possible pre-existing relationship the laboratory would NOT be able to run a sibling test if you believe your cousin could be your sibling. Please contact us to help you find the right test for you.


How accurate is a siblings DNA test?
The siblings being testing are only males. What do you suggest?
The siblings being testing are only females. What do you suggest?

How accurate is a siblings DNA test?

Siblings DNA test results can be very accurate at confirming whether siblings share the same mother or the same father. A siblings test is done in cases where direct comparison of parent-child DNA is not possible by means of a paternity DNA test or maternity DNA test. It is important to understand that testing parentage without the DNA sample of the actual parent will never be as accurate.

The siblings being testing are only males. What do you suggest?

Biologically related males have a very strong mark of genetic relatedness that is indisputable – the Y chromosome. All males descending from the same paternity line will share a distinct Y chromosome profile. Thus, we can establish whether two or more males share a common paternal lineage by testing and comparing their Y chromosome. Read more about Y chromosome testing.

The siblings being testing are only females. What do you suggest?

Females who wish to know if they share the same father can carry out an X chromosome test. If they share the same X chromosome, then they share the same father.

NOTE: in cases where sisters have the same mother, we can only offer this test if the mother’s samples are included. If they not share the same mother, we do not require the sample of the mother.

What are the best testing options for establishing if we have the same mother?

If individuals wish to confirm whether they share the same mother they can opt for two tests:

    • A maternity test: this test will compare the DNA of mother and child to confirm whether the tested mother is the biological mother.
    • A mitochondrial DNA test: this will compare the DNA of individuals tested to confirm whether they have the same maternal line.