DNA Sibship Test

*Pricing includes all result documents.

Laboratory Direct Pricing: US $150 for Complete DNA Sibship Test

*Results in 3 to 5 business days. Express next business day 24 hour shipping available.

Analysis of the DNA of two separate individuals can provide information as to whether they are full siblings, half siblings, or not related. However, unlike paternity testing which provides very conclusive results: 100% for non-paternity and greater than 99.9% for paternity inclusion, the answers provided by sibship testing are not always so conclusive. Please fully understand the benefits and limitations of the sibship test before ordering. The cost for a complete DNA Sibship Test is $150 USD.

Click here to see all your benefits in detail.

About Sibship Testing

When the issue of sibship is in question, the recommended method to determine whether individuals are true biological siblings is to test their parents. DNA paternity and sibship testing will provide conclusive results. However, in situations where the alleged parents are unavailable for testing, a DNA sibship test can be performed to analyze the relationship of biological siblings.

Unlike a DNA paternity test which will always provide a conclusive result, sibship tests are different. When a sibship test is conducted, the DNA laboratory will determine the genetic profile of the alleged siblings. Based on the type of genetic material inherited by each sibling, a sibship index is determined. If the sibship index is less than 1.00, this indicates non-relatedness. If the sibship index is greater than 1.00, this indicates that the two tested individuals are more likely to be true biological siblings. The higher the value of the sibship index, the greater the likelihood that the two individuals are true biological siblings.

To analyze the possibility that the siblings share only one common parent versus two common parents (mother and father), a half sibship index is obtained. The ratio of the half sibship index versus the full sibship index would provide you with an idea of whether the two individuals are more likely to share only one common parent (e.g. mother only) or two common parents (mother and alleged father).

Although the sibship test will not provide you with a conclusive answer, it may be able to provide you with an indication of whether you are more likely to be or not to be the true biological sibling of the other tested individual.


Step 1 - Order the Test

Order laboratory testing by phone at 1-844-687-5958 or by mail, or click here to order online.

Step 2 - Collect and Submit the Samples to the Laboratory

Kits are delivered to your door within 24 hours by courier or within 5 working days by mail. Each sibship test kit comes complete with all of the collection materials and instructions for you to take the test in the privacy of your own home. All sibship testing kits employ the buccal swab technique, allowing you to perform the collection within minutes with no fuss, no pain. Submit the DNA specimen directly to the laboratory after collection.

Step 3 - Wait for Results

DNA sibship test results are available within 3 to 5 business days and can be obtained as soon as testing is completed using your secure order number and password online or by phone. Formal results documents are delivered to you by mail and / or e-mail.