What is Sibling DNA Test?
Sibling DNA Testing is a test that helps potential siblings determine if they share a common parent or parents by testing the genetic material (DNA) of the two possible siblings.
This testing option is often used when an alleged biological father is unavailable to be tested and as an alternative, a sibling test can be performed. The test can also be used if the mother is unavailable.
Legal Sibling Test
Can sibling test results be used for legal purposes?
Yes, sibling test results can be used for legal purposes. The testing will be conducted by our partner laboratory, which is accredited by the AABB, ensuring a strict chain of custody is maintained. The results of such a test can be utilized for legal use such as child custody cases, the amendment of a birth certificate, or for immigration purposes.
We recommend including a known parent (if available) in your sibling DNA test to increase the accuracy of the analysis. While sibling tests performed without a known parent can provide probability of a biological relationship, the accuracy is significantly enhanced when a known parent (typically the mother) participates in the test.
How much does a legal sibling DNA test?
The cost of a legal sibling test starts at $499.99
Schedule An Appointment
The process is simple, We have access to over 2000 specimen collection sites nationwide in our network. Please contact IDTO today at 888-204-0583 to schedule an appointment.
Accreditation
All legal DNA testing services we offer are performed by our partner AABB-accredited DNA Testing Laboratory for the purpose of establishing a proper legal chain of custody for evidence submission.
Results Turnaround Time:
The turnaround time for your results to be available is 2 to 3 business days. Please note, we do provide same-day results for non-legal sibling tests. For more details regarding same-day testing option contact our office at 888-204-0583.
At-Home Sibling Test
At-Home DNA Sibling Tests can determines the probability of shared biological parental relationship.
How much does Home Sibling Test Kit cost?
The cost of an At-Home Sibling DNA Test start at $299.99.
DNA Test Kit Contents
4-6 Sterilized cheek swabs each packet has 2 swabs per person
Contact Identification Form
Sample collection instructions
Prepaid overnight FedEx return shipping envelope
Turnaround Times
How The Process Works:
Getting started with a peace of mind test is simple. Below is a brief outline of what you can expect from our At-Home Avuncular Test process.
- Order below or contact our office at 888-204-0583 to purchase your DNA kit by phone or click here to buy online.
After you purchase your test kit, please allow up to 24 hours or one business day to ship your kit to your home.
Once you receive your kit, follow the instructions on how to collect your DNA samples. Sign the chain-of-custody form. Place all of the contents you receive inside of the prepaid FedEx overnight return envelope you received and ship your genetic samples back to the lab for analysis.
When the lab receives all of your genetic samples. Please allow 2 to 3 business days for your results to be completed. Upon the completion of your results, a copy will be sent to your physical home address and a copy will be sent by email.
Customer Support
IDTO’s knowledgeable and experienced staff is available to answer all questions and concerns regarding you Sibling DNA testing process. Contact our office today at 888-204-0583.
or by email us at contact@idtodna.com or
Click here to leave us a message or visit our contact us page.
Sibling DNA Testing Types
How does siblingship testing work, there are three options in which a sibling test can be performed.
Full vs Unrelated:
This testing option helps to determine if the tested persons share both father and mother or if they are completely unrelated to one another. This comes many times for siblings who were adopted at birth and may find each other through researching their Ancestry. Another common use for this testing option is for Immigration evidence submission to support a claimed biological relationship.
Half vs Unrelated
This testing option helps to determine if two tested persons have different mothers and want to know if they share the same biological father. If this is your specific circumstance. e recommend one mother of the tested siblings participate if available to help increase the accuracy of your DNA test results.
Full vs Half
This testing option helps to determine if two test siblings who share the same biological mother want to determine if they share the same biological father. We also recommend that the mother participates in the testing process if available.
Oftentimes this testing option is performed when family members are uncertain due to family facial features or through conversation between family members about possible uncertainty regarding paternity.
Probability of Siblingship
A sibship index greater than 1.0 suggests a higher probability of individuals being siblings, while an index less than 1.0 indicates a lower probability. The further the index is from 1.0, the stronger the evidence for or against a sibling relationship.
the index is a statistical measure and not a definitive proof of siblingship. Additional evidence, such as family history or DNA testing from parents, may be needed for conclusive results.
Privacy
Please note that the IDTO DNA Testing Center’s partner laboratory does not share any personal or genetic information with third-party companies.
All information provided to our partner laboratory is kept secure and will only be released to third parties with the explicit consent of the participants involved or by court order. DNA samples on file are kept for 3 months on average and then destroyed.
Frequently Asked Questions
Sibling DNA tests are highly accurate for determining biological relationships between individuals when conducted properly. The accuracy of a DNA test is determined by several factors:
- The quality of your DNA sample collection
- DNA samples should be tested and analyzed by an AABB accredited laboratory
- For At-Home Sibling Tests, avoid contaminating your DNA samples
- Have a parent involved (if available) for increased accuracy
To provide a better understanding of what to expect from test outcomes, results are typically interpreted as follows:
- Full siblings: Share about 50% of their DNA (range: 38-61%)
- Half-siblings: Share about 25% of their DNA (range: 18-32%)
- Unrelated: Share less than 1% of their DNA
Results are usually reported as likelihood ratios rather than direct percentages. For example:
- Strong evidence of full siblings: Likelihood ratio > 1000:1
- Strong evidence of half-siblings: Likelihood ratio 10:1 to 1000:1
- Inconclusive: Likelihood ratio 0.1:1 to 10:1
- Evidence of being unrelated: Likelihood ratio < 0.1:1
These guidelines may vary depending on the specific test and laboratory protocols.
Yes. A DNA sibling DNA test can be performed without a parent’s involvement. Please keep in mind if a parent is involved it contribute to increased accuracy of your results.
While sibling DNA tests are highly accurate when conducted properly, there is a small possibility of incorrect results. The accuracy of these tests depends on several factors:
- Quality of DNA sample collection
- Analysis by an AABB-accredited laboratory
- Proper handling to avoid contamination, especially for at-home tests
- Inclusion of a parent (if available) to increase accuracy
Results are typically reported as likelihood ratios rather than absolute certainties. For example, “strong evidence” of full siblings is indicated by a likelihood ratio greater than 1000:1. This statistical approach acknowledges that while highly reliable, these tests are not infallible.
Potential sources of error could include:
- Sample contamination
- Lab processing errors
- Misinterpretation of results
To minimize the risk of incorrect results, it’s crucial to follow all testing protocols carefully and use accredited laboratories. If there are doubts about the results, retesting or consulting with a genetic counselor may be advisable.