
DNA Sibling Test
- Fast results within 1-2 working days
- Easy at-home sample collection
- AABB, ISO/IEC 17025 & CAP-CLIA Accredited
$149 $271
Need a legally admissible test for court?
DNA Sibling Testing
Are you unsure if you and your sibling share the same father or even the same parents? The DNA Sibling Test is an excellent choice to determine whether two or more individuals are full siblings, half siblings or not siblings at all.
Our state-of-the-art laboratory ensures precise results, giving you the confidence and clarity you seek. However, if the parents in question are available for testing, we recommend taking the paternity or maternity test for even greater accuracy.
How it works

Order
Order your kit online and collect your samples with the supplies inside your kit.

Send
When you’re finished collecting your samples, simply mail them to the lab for analysis.

Analysis
Testing begins as soon as your package is delivered to the laboratory.

Results
Download your results from your secure online account as soon as they’re ready.

Painless Mouth Swabs

Secure Digital Results
Frequently Asked Questions
Yes! If test participants are in different locations, we can send parts of the DNA test kit to multiple addresses. During checkout, simply enter “Please split kit” in the “Additional Notes” box and specify where each component should be sent. For example, you can request: “Send one kit to [Name, Address]” and “Send the second kit to [Name, Address].” Each kit is individually barcoded, ensuring all samples are processed together at our laboratory.
For legal matters such as court proceedings, child custody, support cases, or inheritance claims, you will need to order the Legal DNA Sibling Test. This test requires a chain of custody procedure to ensure the results are admissible in court. The process includes having DNA samples collected by an impartial third party, proper identification of participants, and samples being directly sent to the testing laboratory. Legal DNA Sibling Testing is available in the US, Canada, and the UK.
No, the test kits do not have an expiration date and can be stored indefinitely before sample collection. However, once a sample is collected, it is recommended to send the kit to our laboratory for testing within 3 months.
Your results will display two numbers (alleles) for each marker, representing the number of repeats inherited from each parent. You may have identical alleles at a marker, or different ones. These allele numbers are compared between the two individuals being tested, and a statistical analysis determines the likelihood of them being biologically related siblings.
- Full siblings (same mother and father) will have a sibling index greater than 1.0.
- Half siblings (one parent in common) will also have a sibling index greater than 1.0.
- The higher the sibling index above 1.0, the stronger the evidence that the individuals are biologically related as siblings.
- Non-siblings typically have a sibling index value of less than 1.0.
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