Accredited USA Lab
Testing performed by a fully accredited laboratory in the United States.
Accredited Sibling DNA Test
Full or Half Siblings?
Our At-Home Sibling DNA Test helps determine the likelihood that two individuals are full siblings, half siblings, or there is no evidence of a biological relationship by comparing their genetic profiles. Our sibling paternity test can be performed without parents using only the two siblings, although including the mother strengthens the sibling test results.
Buy the best DNA sibling test for you. Choose the 34-marker or advanced 46-marker option for maximum accuracy of the results. Sibship tests are more complex than a paternity test, so analyzing more genetic information helps reduce the likelihood of an inconclusive result. Click Here For A Court-approved test for Siblings. FREE & FAST Shipping Both Ways.
Enhanced 34 Marker Analysis
Our 34-marker testing option analyzes 24–34 DNA markers, delivering greater statistical confidence than the 16–22 marker sibling tests commonly available on the market. Analyzing more markers increases the amount of genetic data available for comparison and may help reduce inconclusive outcomes.
This test is especially effective when the mother participates, as maternal DNA helps refine the analysis and improve statistical accuracy. However, a siblingship test without parents can still be performed using only the two siblings.
All testing is performed in accredited U.S. laboratories, ensuring professional laboratory standards, secure sample handling, and strict confidentiality. PaternityUSA does not sell, share, or store DNA data in external databases.
Results are typically available within 2–3 business days after the laboratory receives the samples, providing reliable answers with a fast turnaround. FREE & FAST 2-Way Shipping Included.
Premium 46 Marker Analysis Without Parents
Our 46-marker testing option analyzes a full 46 DNA markers, providing enhanced statistical confidence for sibling relationship testing. This option is particularly helpful when the mother is unavailable, where analyzing a larger number of markers can strengthen the DNA comparison.
By examining more than twice as many markers as many standard 20–22 marker tests, this advanced analysis provides additional genetic evidence and may help dramatically reduce inconclusive outcomes.
All samples are processed using validated laboratory methods in accredited U.S. facilities, ensuring professional laboratory standards, secure handling, and strict confidentiality. PaternityUSA does not sell, share, or store DNA data in external databases.
Results are typically available within 2–3 business days after the laboratory receives the samples, providing reliable answers with a fast turnaround. FREE & FAST 2-Way Shipping Included.
Order Your DNA Test
NEW YORK NOTICE: Due to NY state regulations, we cannot ship home testing kits to addresses within the state of New York. Please call 1-877-786-9543 for assistance.
25+ Years of Experience
Trusted by families nationwide for over two decades.
46 Marker Testing
Higher marker count for greater accuracy and confidence.
Fast & Private Results
Quick turnaround with complete confidentiality.
How Does Our Accredited Sibling DNA Test Compare?
Our at-home sibling Tests are processed by Clia certified AABB accredited U.S. laboratory partners.
We offer two distinct testing tiers depending on your family situation:
- Standard 34-Marker Test: This option analyzes 24–34 markers and is a money saving option when the mother is available to test.
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Premium 46-Marker Test: A 46 maker test is ideal if the mother is unavailable, and minimizes the likelihood of inconclusive results.
Both of these DNA sibling test kit options help determine if the father is shared or not without performing a paternity or maternity analysis.
Once all samples arrive at the laboratory, testing services are performed, and results are typically completed and delivered securely via email within 2–3 working days. For more than 25 years, families nationwide have relied on PaternityUSA for affordable relationship testing, trusted laboratory accuracy, and fast turnaround times.
Our 34 Marker Test
$125
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24-34
Marker Count
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FREE
mom inclusion
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High
Conclusiveness
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FREE
2-Way Shipping
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Our 46 Marker Test
$175
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46
Marker Count
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Extra Fee
for mom inclusion
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Highest
Conclusiveness
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FREE
2-Way Shipping
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Typical Competitors
Up to $299
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16-22
Marker Count
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Extra Fee
for mom inclusion
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Variable
Conclusiveness
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Variable Pricing
on 2-Way Shipping
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A Simple, Straightforward Process To Our Accredited Sibling DNA Test
Testing DNA at home is simple, private, and designed to deliver accurate results in just a few easy steps. Step 1: Order Online | Step 2: Collect Samples | Step 3: Return Samples | Step 4: Receive Accurate Results.
Buy DNA Kit NowOrder Your Sibling Test
Place your order online, and your at-home collection kit will be shipped quickly to your address. For home sibling testing, a split kit is also available for delivery to multiple addresses.
Collect Your DNA Samples
Use the included cheek swabs to collect DNA samples easily and painlessly by following the step-by-step instructions, then complete and return the testing consent form.
Return the At-Home Test Kit
Place the samples in the provided packaging and send them back to the laboratory using the prepaid return mailer.
Receive Your DNA Results
Once the lab receives your samples, analysis begins and your results are delivered securely by email within a 2-3 working days.
Answers to Common Accredited Sibling DNA Test Questions
Find clear answers to common questions about the testing process, shipping options, turnaround times, and how to achieve the most accurate and reliable results.
A sibship test is highly accurate and provides strong statistical evidence to determine if individuals are full siblings, half siblings, or unrelated.
PaternityUSA offers both 34-marker and advanced 46-marker testing options. Analyzing more genomic markers can strengthen the statistical evaluation and help reduce the likelihood of inconclusive results, especially when a parent is unavailable for testing.
DNA kits are shipped FAST and FREE via trackable USPS delivery to addresses within the contiguous United States. Each kit includes a prepaid return envelope for sending samples back to the laboratory.
Expedited shipping options are available during checkout for physical addresses within the contiguous U.S.
If needed, participants may also choose the Collect & Send option and submit samples using their own swabs.
Orders placed before 12:00 PM (EST) Monday through Friday generally ship the same business day, helping reduce overall turnaround time.
Most results are completed within 2–3 business days after the laboratory receives all samples. They are emailed directly to you without the need to create an account to retrieve them.
Yes, a test can be done without the mother's or father's DNA. However, including the mother, when available, can significantly improve the conclusiveness of a genetic kinship analysis. Because each child inherits half of their DNA from their mother, her genetic contribution can be identified and excluded, allowing the laboratory to focus more directly on the paternal comparison.
If the mother is not available, selecting the 46-marker testing option is recommended to provide greater statistical confidence. Testing can still be completed without the mother if necessary.
PaternityUSA analyzes either 34 or 46 DNA markers depending on the testing tier you choose. While standard industry tests only evaluate 16–22 markers, our advanced analysis evaluates up to twice as many genetic loci to deliver maximum statistical confidence.
This kinship test can help determine whether tested individuals share the same biological father (full sibs) or one parent (half sibs). If the maternal relationship is known, the test focuses on the paternal comparison. When parentage is uncertain, additional testing options may be available. This test is not designed to evaluate possible cousin relationships. If you are unsure which test is appropriate, our team can help you review your options.
Yes. If participants are located in different cities or states within the contiguous United States, additional shipping addresses can be added during the ordering process. Each participant will receive their own sampling kit with a prepaid return mailer.
All kits are linked to the same order using unique barcodes to ensure accurate processing. For shipments to Alaska, Hawaii, U.S. territories, or international locations, please contact our office to confirm availability and pricing.
This test is not designed to evaluate possible cousin relationships. A sibship test is designed to evaluate whether two individuals are whole siblings, half siblings, or unrelated. Because cousins can share significant amounts of DNA, a sibship test is generally not the preferred method for distinguishing between sibling and cousin relationships. Additional family members or alternative testing options may provide stronger statistical evidence.
If all tested siblings are male and the question is whether they share the same biological father, a Y-STR test is often the best option because it provides a clear inclusion or exclusion of a shared paternal line. A standard 20-22 marker test may sometimes produce inconclusive results, whereas a Y-STR test focuses solely on the existence of a shared paternal line.
The main exception is when the possible fathers are closely related males, such as brothers, father and son, or other men from the same paternal family line, since they can share very similar Y-chromosome profiles.
No a home test may only be used for personal knowledge. However, A legal test can be used for official and court-recognized cases when proper procedures are followed. Legal sibling testing requires strict chain-of-custody procedures and is commonly accepted for matters such as child support, visitation, adding or correcting a name on a birth certificate, estate and probate cases, wills, and other legal situations where proof of a brother – sister relationship is required.
If testing is needed specifically for immigration purposes—such as for USCIS, ICE, Department of Homeland Security, embassy cases, passports, or a Consular Report of Birth Abroad (CRBA)—special immigration testing requirements apply, and the test must be coordinated through an AABB-accredited immigration testing provider to ensure the results are accepted by the requesting agency.
Yes, actual PHD geneticists supervise the tests. Furthermore, all testing is performed in accredited laboratories under the supervision of experienced PhD-level geneticists. Strict quality-control procedures help ensure accurate sample handling, reliable results, and scientifically validated reports.
The primary differences between an at-home test and a court admissible test are:
At-Home Test: Done privately for personal knowledge; cannot be used in court.
Legal Test: Requires a strict chain-of-custody and an unbiased third-party collector; fully approved for court cases.
Peace of Mind Test (At-Home DNA Test): This test is intended strictly for personal knowledge and reassurance. The collection kit is sent directly to your home, and participants swab themselves privately. Because there is no independent verification of who actually provided the genetic samples, the laboratory issues a report for informational purposes only, and the results cannot be used as legal proof.
Legal DNA Test (Chain-of-Custody Test): This test is required if you need the results for official purposes, such as child support, custody disputes, immigration, inheritance claims, or birth certificate changes. To ensure validity, the collection must follow a strict Chain of Custody process. An unbiased, approved third-party collector must verify the participants' identities, take photographs, and securely package and ship the samples directly to the accredited laboratory.
Yes. A baby can take the test. The testing process relies on a painless, simple, and non-invasive cheek cell collection, so it can be safely performed on newborns or infants.
The DNA collection process is entirely painless and can be performed safely on newborns, infants, toddlers, and adults alike. To collect a sample from a baby, gently rub the soft collection applicator along the inside of their cheek for a few seconds to gather skin cells. It is recommended to perform the test before the baby eats or drinks to ensure a clean sample.
Yes, you can test DNA without a cheek cell sample by using alternative genetic sources. If a mouth sample cannot be collected, the laboratory can process non-standard samples including:
Hair with the root attached
Fingernail clippings
Used toothbrushes
Earwax or mucus on a tissue
Because DNA quality can vary, we recommend speaking with a DNA specialist before submitting non-standard specimens. Call us at (877) 786-9543.
Our 34 marker siblingship tests cost $125, and analyzes more markers than the standard 20-22 marker test available in the market place.
Our 46 marker siblingship test cost $175, analyzes twice as many markers as the standard 20-22 marker test, and delivers maximum accuracy of the results. Analyzing more DNA markers can dramatically reduce the likelihood of an inconclusive result.
Yes, it is entirely normal for two siblings to have different DNA profiles. While full biological siblings share roughly 50% of their DNA on average, each child inherits a completely unique combination of genetic material from their parents.
For relationship testing, accredited DNA siblingship tests analyze specific genomic markers to determine whether two individuals are likely to be whole siblings, half-siblings, or unrelated. These results are based on statistical analysis of shared DNA and are highly accurate when samples are collected and processed correctly.
No. Full biological siblings do not share 100% of their DNA. On average, whole siblings share about 50% of their DNA because each child inherits a unique combination of genetic material from their parents. This means siblings can have many genetic similarities while still having important differences in their DNA profiles.
The exception is identical twins, who originate from the same fertilized egg and share nearly 100% of their DNA. For all other siblings, genetic testing can identify the amount of shared genetic material and help determine if the test participants are full siblings, half-siblings, or have no biological relatedness as siblings.
The home testing process is simple, the tested individuals provide genetic samples, usually through a simple cheek cell collection. Our AABB accredited U.S. laboratory partner compares their genetic information and analyzes the amount of shared DNA to determine whether they are likely to be full siblings, half-siblings, or unrelated. If the results are needed for legal purposes, a court approved chain-of-custody test is required. Instead of collecting samples at home you simply go to one of our over 4,000 clinic locations. Call us at (877) 786-9543, and a case manager can help answer all your questions.
While a standard sibling test typically evaluates 20 to 34 genetic loci, analyzing 46 genomic markers provides a massive statistical advantage. Sibling testing is inherently indirect; siblings only share a statistical percentage of their DNA, rather than a direct inheritance line like parent-to-child.
By checking 46 markers, the lab drastically increases the number of comparison data points. This extra depth significantly raises the likelihood ratio, providing conclusive answers and lowering the risk of frustrating "inconclusive" results—especially when the mother's DNA cannot be included.
Accredited Sibling DNA Test Reviews
For over 25 years, families across the United States have relied on our DNA testing for accurate results and dependable service.
“In my opinion I am very satisfied. I have an adult daughter that’s 24 years old now that I did not know I had. The results came in very quickly, took a couple of days, and I am very pleased with this product. If I need it again, this is what I’ll get. I will definitely recommend this to anybody that needs to do a DNA test.”
Customer Reviews
It was perfect!
Thank you for the quick response. Quick results and for the answers we needed to move forward in life!
Fri Feb 27 2026 22:05:00 GMT+0000 (Coordinated Universal Time)
This gave me so much
This gave me so much peace. Thankful for your quick response!
Fri Feb 13 2026 18:06:00 GMT+0000 (Coordinated Universal Time)
Great Products
The process was seamless and quick.
Wed Feb 11 2026 19:57:00 GMT+0000 (Coordinated Universal Time)
Great experience, definitely recommend!!
Quick results very helpful staff, good communication!
Mon Feb 09 2026 17:46:00 GMT+0000 (Coordinated Universal Time)
Easy and quick, but results not straightforward
I did the sibling test and everything about the process was quick and easy, except interpreting the results and calling was not an option. Once I emailed, I got a response to my questions quickly.
Sun Nov 16 2025 19:15:00 GMT+0000 (Coordinated Universal Time)
Not a clear explanation
I feel like a person should call and explain results more clearly.
Tue Aug 26 2025 15:19:00 GMT+0000 (Coordinated Universal Time)
Process
The process seems simple. However we have not agreed to send in test. I believe we may need more time. Can the test case be extended?
Sun Jul 20 2025 21:53:00 GMT+0000 (Coordinated Universal Time)
Testing
5 star
Sun Apr 27 2025 11:03:00 GMT+0000 (Coordinated Universal Time)
Wonderful service
We had previously used a different lab and got inconclusive results. This lab was quick, efficient and precise. Very satisfied!!!
Tue Apr 08 2025 16:46:00 GMT+0000 (Coordinated Universal Time)
amazing results
I used this twice and found 2 of my siblings. .
Fri Mar 28 2025 20:25:00 GMT+0000 (Coordinated Universal Time)
Private, Secure, and Confidential Testing
Your Privacy is Protected at Every Step
Strict privacy controls are in place from DNA sample collection through result delivery. At PaternityUSA, your DNA and personal information are treated with strict confidentiality and are never sold, shared, or stored in external databases. We Value Your Privacy!
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