Is your alleged biological father unavailable for DNA testing? Are you uncertain whether you and another individual are biologically related as full or half siblings? A sibling DNA test can help determine whether two individuals share the same biological father, mother, or both parents.
Sibling DNA testing is a relationship DNA test used to determine whether two alleged siblings are biologically related. This testing option can be performed for legal or non-legal purposes. All legal sibling DNA testing services are performed through our partner AABB-accredited laboratory. This accreditation helps ensure a strict chain-of-custody process and allows your legal DNA test results to be recognized by courts, immigration agencies, and government institutions nationwide.
IDTO DNA has over 22 years of experience providing relationship DNA testing services nationwide. Our focus is to provide fast, accurate, and reliable sibling DNA testing while maintaining professional communication throughout the entire process. We help clients avoid confusion, unnecessary delays, and weeks of uncertainty by providing clear guidance before, during, and after the DNA testing process.
How much does a Sibling DNA Test cost?
Starting price at $299.99. Below are our sibling testing options.
Testing Options
Home Testing Kit:
Pricing Starts at $299.99
At Home Sibling Testing option is for peace of mind purposes only. Results cannot be used for legal purposes. Below are the contents of DNA test kit:
- 4-6 sterilized buccal swabs (2 swabs per person)
- Sample collection instructions
- Contact identification form
- Prepaid overnight FedEx return shipping
Please note: At-Home DNA Test results cannot be used for any legal purposes. In addition At-Home DNA test kits are prohibited to be sold to New York State residents due to the New York State Department of Health (NYSDOH) guidelines.
Legal Testing
The cost of legal sibling (brother and sister) DNA test starts at $499.99. See below to schedule an appointment in-office.
| Test Type | Cost | Additional Person |
| Legal Half Sibling DNA Test(2 people) | Starts at $499.99 | $150.00 |
| Legal Half Sibling DNA Test(Both siblings live in two different locations) | Starts at $499.99 | $150.00 |
| Legal Full Sibling DNA Test(2 people) | Starts at $499.99 | $150.00 |
| Legal Full Sibling DNA Test(Both siblings live in two different locations) | Starts at $499.99 | $150.00 |
Where can I go to get a sibling test?
Contact our office today at 888-204-0583 to schedule your sibling DNA testing appointment. IDTO DNA has over 3,000 DNA sample collection sites nationwide located near most major cities, making the appointment process fast, convenient, and accessible for families throughout the United States. Below are areas we service.
Can a sibling test be used for immigration purposes?
Yes. A sibling DNA test can be used for immigration purposes to help support a claimed biological relationship between two alleged siblings. Immigration DNA testing is commonly requested when primary evidence, such as birth certificates or other supporting records, is considered insufficient by an immigration agency.
To perform an immigration sibling DNA test, the petitioner or beneficiary should first receive a Request for Evidence (RFE), Form I-130 notice, or an official DNA testing request from USCIS, a U.S. Embassy, or a U.S. Passport Agency. This process helps ensure a proper immigration chain-of-custody can be established by our partner AABB-accredited laboratory.
It is important to understand that immigration DNA testing is voluntary and used as secondary evidence. Performing a DNA test does not guarantee visa approval, citizenship approval, or any immigration benefit determination by USCIS or another government agency. Learn more details about our immigration DNA testing here.
What are the types of Sibling tests can be performed?
Full Sibling DNA Test:
A full sibling DNA test helps determine whether two individuals share the same biological mother and biological father. Full siblings generally share approximately 50% of their DNA.
Half Sibling DNA Test:
A half sibling DNA test helps determine whether two individuals share one biological parent. This testing option is commonly performed to help establish a paternal relationship when the alleged father is unavailable for testing. Half siblings generally share approximately 25% of their DNA.
Unrelated DNA Test Result:
An unrelated result means the DNA analysis found no biological relationship consistent with full siblings or half siblings.
Please note: Once your case has been initiated you will be assigned a case manager that will answer you questions and guide you through your entire DNA testing process from beginning to end.
What is the method of DNA sample collection?
The standard DNA sample collection method is performed using a cheek swab collection. Buccal swab DNA collection is painless, non-invasive, and highly accurate for sibling DNA testing.
Blood sample collections are available in certain situations, though this collection method is more invasive and typically unnecessary for most relationship DNA tests.
Can I use an alternative DNA sample for DNA sibling test?
Yes. Alternative forensic DNA samples can be used when an alleged father, child, or sibling is unavailable to participate in the DNA testing process.
| Common Forensic DNA Samples | Legal Use |
| Blood Stain | Cannot be used for legal purposes |
| Hair Follicles | Can be used for legal purposes. If a chain of custody can be established. Commonly used for deceased relative cases. |
| Toothbrush | Cannot be used for legal purposes |
| Earwax | Cannot be used for legal purposes |
| Fingernails | Can be used for legal purposes. If a chain of custody can be established. Commonly used for deceased relative cases. |
| Used Kleenex | Cannot be used for legal purposes |
Frequently Asked Questions
How long will it take to receive my siblingship DNA results?
The turnaround time for results is 2 to 3 business days from the date the laboratory receives all DNA samples.
Are sibling DNA test results accurate?
Yes. Sibling DNA testing is highly accurate when proper chain-of-custody procedures and accredited laboratory testing standards are followed. All DNA samples undergo a strict dual-analysis process to help ensure accurate and reliable results for claimed biological relationships.
All legal sibling DNA tests are performed through our partner AABB-accredited laboratory. This accreditation helps ensure the DNA test results are recognized by family courts, immigration agencies, and government institutions nationwide.
Our partner laboratory analyzes between 18 and 22 genetic markers during the sibling DNA testing process to determine the probability of a biological relationship. Inclusion results commonly produce a probability of siblingship of 99% or higher.
In exclusion cases, additional extended DNA analysis may be performed using up to 27 genetic markers to help determine whether the tested individuals are biologically unrelated.
Can you do a Sibling DNA test without parents?
Yes. A sibling DNA test can be performed without a parent participating in the DNA testing process.
Parent participation can help increase the accuracy and strength of the DNA analysis because the laboratory has additional genetic information available for comparison during the relationship testing process.
Do siblings have different DNA?
Yes. Siblings have different DNA even though they share a biological relationship. Full siblings typically share approximately 50% of the same DNA inherited from their biological parents. The remaining DNA differs because each child receives a different combination of genetic material from the mother and father.
Identical twins share nearly identical DNA because they originate from the same fertilized egg. Small genetic variations can still occur between identical twins over time.
Can a DNA Sibling test result be used to confirm Ancestry Testing research?
Yes. A sibling DNA test can help confirm whether someone identified through ancestry research is biologically related to you as a full sibling or half sibling. A sibling DNA test is a biological relationship test and should not be confused with ancestry testing.
It is important to understand that ancestry testing and DNA relationship testing serve different purposes.
Ancestry Testing:
Ancestry DNA testing is designed to explore ethnic origins, family lineage, and ancestral connections. These tests are commonly used for informational or entertainment purposes and are generally not intended for legal use.
DNA Relationship Testing:
DNA relationship testing is performed to determine whether individuals are biologically related. Common relationship DNA tests include paternity testing, sibling DNA testing, grandparent DNA testing, and avuncular DNA testing. Legal DNA relationship tests performed through an accredited laboratory can be used for legal and immigration purposes when proper chain-of-custody procedures are followed.
Are my DNA results kept private?
Yes. IDTO DNA and its partner laboratory do 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. Specimen samples on file are kept for an average of 3 months, then destroyed.
Why Choose Us IDTO DNA
IDTO DNA is a BBB accredited company who continue to serve thousands of families nationwide with their sibling testing needs. Since 2004, we have been a trusted source for both legal and medical professionals seeking reliable DNA testing for their clients.
Our knowledgeable staff will guide you in selecting the right type of genetic test for your specific situation. This careful attention helps prevent ordering the wrong relationship test and avoids the need to pay for additional testing.
