DNA Sibling Test

Fast, Powerful and Proven

The DNA Sibling Test is used in situations where the alleged parent(s) are not available for testing. The DNA Sibling Test provides the likelihood that alleged siblings are full siblings, half siblings, or not related at all. Whenever the parent(s) in question are available for testing, the DNA paternity or maternity test is recommended over the DNA sibling test. However, in situations where the alleged parents are missing or deceased, then the sibling test is the next best option for investigating the relationship of potential siblings. The full genetic report is included with every test.

Private DNA Sibling Test

Find out the truth in private before deciding on the next step

Legal DNA Sibling Test

Receive legal documents for use in court

DNA Immigration Test

AABB-Accredited DNA immigration testing for the USCIS/US Embassy


During a DNA sibling test, a buccal swab (mouth swab) is collected from each of the alleged siblings to obtain cells containing genetic information in the form of DNA (deoxyribonucleic acid). Each person’s DNA represents a unique “genetic blueprint,” similar to a fingerprint.

In the laboratory, the DNA is extracted from the cells, and specific DNA regions are amplified through a process called PCR (polymerase chain reaction) for thorough examination. The siblings’ DNA patterns are then compared to each other. A statistical analysis is conducted based on the match type typically expected for true biologically related sibling pairs, generating a “full sibling index” and “half sibling index.”

True biologically related full sibling pairs (with the same mother and father) usually have a full sibling index value greater than 1.0 in their DNA sibling test report. Conversely, individuals who are not full siblings typically have a full sibling index value less than 1.0.

True biologically related half sibling pairs (with only one parent in common) usually have a half sibling index value greater than 1.0 in their DNA sibling test report. Conversely, individuals who are not related typically have a half sibling index value less than 1.0.

The higher the sibling index value over 1.0, the greater the likelihood that the two individuals are biologically related as siblings. Similarly, a half sibling index value of 1.5 indicates that the siblings share more genetic material than would be expected by chance alone. Conversely, the lower the sibling index value is below 1.0, the lower the probability that the two individuals are biologically related as siblings.

Turnaround Time

With advanced DNA technology, maternity testing is accurate, rapid and affordable. Maternity can now be determined 3 to 5 business days after the samples arrive at the laboratory. Results are released immediately once the testing is completed.


DNA sibling testing can be arranged online, by phone or by fax. Questions can be directed to the laboratory by email at info@genetrackus.com or by phone at 1-888-802-0703. Our DNA advisors will be able to answer any questions you may have or to help you to schedule an appointment for testing.

Test Type Legal Test Kit
2 siblings $255
2 siblings, 1 mother $350
3 siblings $350
3 siblings, 1 mother $445
4 siblings $445
5 siblings $540
6 siblings $635
7 siblings $730
For legal testing, a specimen collection and witnessing charge of $50 will apply for each individual whose sample is collected at one of our locations in the U.S., and $100 for each individual whose sample is collected overseas. A $25 charge will apply if individuals in the same case are collected at different locations.


Who should consider the Private Test option?

The private home test kit option is suitable for individuals who wish to find out the truth about maternity before deciding on the next step. If a private test is ordered, a buccal swab (mouth) swab DNA kit is sent directly to the parties involved in the test for sample collection. The sample collection process is quick, easy and discreet and takes just minutes to complete. Once the laboratory receives the samples, testing is completed within 3 to 5 business days.

Can the kit be shipped to more than one address if the parties live in different cities?

If the people being tested live at different addresses, we can divide the DNA testing kit and send each part to separate locations. The kits have barcodes to make sure the samples are still tested together when they arrive at the laboratory. To get a split kit, write “please split this kit” in the comments section of the online order form and give us the name and address of where to send each part. For example, you could say “send the Alleged Father’s part to…(provide name and address)” and “send the Child’s part to…(provide name and address).” Alternatively, you can have the complete kit shipped to you and divide it yourself, and then send the parts to the other people involved in the testing.

Who should consider the Legal Test option?

Legal DNA tests are commonly used to provide court-admissible evidence for or against biological relationships in various legal scenarios, including court cases, custody and estate disputes, and inheritance. If you choose the legal testing option, we will schedule an appointment for all parties involved to provide samples at one of our designated Genetrack chain-of-custody sample collection facilities.

What if the parties to be tested live in different cities or do not wish to attend the same appointment?

We know that it can be challenging when people involved in DNA testing live in different cities. To make things easier, we can arrange separate appointments for each person at their own location. Our scheduling department will coordinate the appointment dates for each individual, making the process as smooth and hassle-free as possible.

Is the Private Home DNA Test as accurate as the Legal Test?

The Home DNA Test is just as accurate as our standard legal tests and will provide absolutely conclusive results. The only difference between the private test and the legal test is whether the sample collection is witnessed.

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