Sibling DNA Test

From just $149, including your test kit and all lab fees, our Sibling DNA Test can help individuals determine whether they are full-siblings or half-siblings, with results in just 3 business days.

When both people have the same biological parents, they are classed as full-siblings (e.g. full biological brother or sister). Half-siblings (e.g. half brothers or sisters) are individuals who share only one biological parent, either the mother or father.

When testing for sibling relationships, cheek swabs are used to collect DNA samples from each sibling. For the most conclusive result, we also ask for the biological mother's sample, if available.

The DNA laboratory will then determine the genetic profile of the possible siblings and will calculate a sibling DNA index or likelihood ratio.

A likelihood of greater than 10 indicates that the siblings are related, either full or half, but a likelihood of less than 0.1 does not support this.

A likelihood that falls between 0.1 and 10 is inconclusive, which means that a relationship cannot be determined, based on the data collected and analyzed. The higher the value of the sibling DNA index, the greater the chance that the two individuals tested are full biological siblings.

It is possible to analyze two individuals to determine whether they are more likely to share the same mother and father, share just one common parent, or be totally unrelated.

Order your Sibling DNA Test online now.

We also offer interest-free payment options including PayPal Pay in 4 and Klarna Pay in 4, so you can get answers when you need them.

You can order our Sibling DNA Test online now from just $149.

The cost of the test includes your test kit and all lab fees, and the test includes enough cheek swabs to test two siblings and the biological mother, if available.

If you would like to test three siblings, you can select this option for an additional $69 when placing your order.

Order your Sibling DNA Test online now.

You can also spread the cost of your test with interest-free payment options, including PayPal Pay in 4 and Klarna Pay in 4, so you can get answers when you need them.

Your test kit will be sent out in discreet, plain packaging, for full confidentiality. 

Our standard sibling test is already industry-leading, as it analyzes 25 DNA markers (the industry standard only analyzes 16-21 markers).

What makes AlphaBiolabs unique is that we can also analyze up to 45 DNA markers. This allows more genetic material to be analyzed, which strengthens the result and provides additional reassurance.

This is ideal for customers who want the most powerful DNA test available.

It is also particularly useful in tests of a more complex nature, such as a sibling test, where the chance of obtaining a conclusive result will always be lower than the more straightforward paternity or maternity tests. This is because the DNA hasn’t been directly inherited. The enhanced test will increase the chance of obtaining a conclusive result.

For $149, including your test kit and all lab fees, our Sibling DNA Test kit includes:

• Test request/consent form
• Complete, easy-to-follow instructions on how to take the test and return your samples to our laboratory
• A pre-addressed envelope to send your samples back to us
• Three DNA sample collection swab packages, containing one swab in each package
• Individual DNA test sample envelopes for each participant

If you need to test more individuals, you can easily select this option while placing your order.

Once we have received your samples at our laboratory, we will email your password-protected results in 3 business days.

Order your Sibling DNA Test online now for $149.

Once you have received your kit, simply follow the instructions included to collect your samples.

Rub the swab gently and painlessly on the inside of the cheek to collect cheek cells. Enough swabs are provided to test two siblings and the biological mother, if available for testing.

If you would like to test three siblings, please select this option when placing your order, and additional swabs will be included in your kit (fees apply). 

For the most conclusive result, we do ask that the biological mother also provides a cheek swab sample, if possible.

However, this is not essential, and we can still perform a sibling DNA test without the mother’s sample. 

Your test kit will contain enough cheek swabs to collect DNA from two siblings and the biological mother (if available).

Yes, a sibling DNA test can be performed without a parent’s sample.

For the most conclusive result, we do ask that the biological mother also provides a cheek swab sample, if possible. However, this is not essential, and the test can still be performed without the mother’s sample.

Simply buy your test online now, and we’ll mail it out to you immediately.

Your test kit will be sent directly to your chosen address in discreet, plain packaging, for complete confidentiality. 

You can choose to receive your kit by USPS First Class Mail (included in the cost of your test), or upgrade to USPS Priority Mail (+$9.99) or USPS Priority Mail Express (+$24.99).

Once you have collected your samples, simply mail them back to our laboratory using your preferred shipping method.

As soon as we receive your DNA samples, we begin the testing process at our accredited laboratory.

You will receive your results by password-protected email in 3 business days after we have received your samples.

Our Sibling DNA test results are 100% accurate and reliable based on the samples we receive at our laboratory.

We are also accredited to the international quality standard ISO 17025 for our DNA testing.

The difference between full and half-sibling DNA stems from how many biological parents they have in common.

Full siblings who have the same biological mother and father are known as first-degree relatives and share approximately 50% of their DNA.

Half siblings who have one biological parent in common – their mother or father – are known as second-degree relatives and share approximately 25% of their DNA.

Yes, AlphaBiolabs can mail your Sibling DNA Test kits to two different addresses.

You will find the option to list a 2nd address when you check out.

Both test kits will be sent out in discreet, plain packaging, for full confidentiality. 

At AlphaBiolabs, we offer peace of mind testing with all our DNA testing kits.

As the name suggests, a peace of mind DNA test is for personal use only.  

The results of these tests can give you the answers you need, but they cannot be used for legal purposes or in court proceedings.

Peace of mind tests also allow you to collect your samples quickly and easily at home, without the need to use a more costly and time-consuming third-party to verify the DNA sample collection.

If you require a legal DNA test, click here or call 727-325-2902.

The results of our peace of mind DNA tests and our legal DNA tests are 100% accurate and reliable based on the samples we receive into the laboratory, and analysis is performed in the same way for both types of tests.

The fundamental difference between the two is the way in which samples are collected, and the procedures that must be followed during sample collection for DNA test results to be admissible in court/for legal matters.

Peace of mind DNA testing is designed for personal use, providing accurate and reliable information about biological relationships. The results can help you find answers to your questions, but they cannot be used as evidence in court or for other legal matters. You can also collect your own DNA samples at home for peace of mind testing, with our easy-to-use at-home testing kits.

Legal DNA testing is specifically designed for use in court or official proceedings. These tests require samples to be collected by an authorized professional under strict chain-of-custody procedures to ensure the integrity of the process. The results of legal DNA tests are legally admissible and supported by detailed reports prepared in compliance with legal standards.

Legal DNA tests are commonly used for a variety of reasons including establishing parentage in child custody, visitation, or child support disputes, for birth certificate changes, for inheritance and estate settlements, and more.

Learn more about our AABB and ISO 17025-accredited legal DNA testing.

Yes, for more information on our legal DNA tests, please visit here.

We offer a wide range of legal DNA tests that are all AABB accredited and court admissible for many different legal matters. Results are provided in just 3 business days and prices start from just $279.00. Call us now on 727-325-2902.