Sibling DNA test accuracy – more DNA markers tested mean the most accurate sibling test results. It’s a scientific fact.
We offer DNA testing that is over 1,000 times more powerful than the industry standard 16 marker test.
Our DNA testing for sibling relationships is composed of 50% more specific genetic markers than the DNA industry standard. We have chosen not to offer lower marker testing because of our concerns regarding the accuracy of the results. This allows for us to deliver results that are the most accurate available (based on the genetic samples provided). The results from our sibling test are so accurate they are the same for both legal and home testing options.
Half sibling and full sibling test results are written in non-scientific language and are easy to understand.
What is sibling DNA testing?
A Sibling DNA test determines the statistical probability that two or more persons are or are not biologically related as full or half brothers and/or full or half sisters.
This test is normally performed when a standard paternity test is not possible. The sibling test is the best way of establishing paternity through the alleged father’s suspected children. Our testing will show the likelihood that they are biologically related to each other.
Full sibling vs half sibling DNA tests
What makes two children full-siblings or half-siblings is how much genetic information, or DNA, they share. Each of us gets half our DNA from our mother and half from our father.
Full siblings have the same mother and the same father. These siblings get all of their genetic information from the same two people, and they share 50% of the same DNA. Half siblings only share DNA from one parent, and share 25% of the same DNA. The genetic information from the other parent is different. A half sibling shares the same percentage of DNA with their brother or sister as with a grandparent. They also share this same amount of DNA with an aunt or uncle. First cousins share just 12.5% of the same DNA, second cousins 6.125%, etc.
Choosing the most accurate DNA test to answer your questions
You have two options to choose when you order a your DNA test:
Full Siblings vs. Half Siblings. In this type of sibling test, the DNA of two individuals, or more, who share the same biological mother are compared. This will determine the probability, or likelihood, that they have the same biological father. For these tests, we recommend that, if possible, samples from the biological mother also be tested. However, if this is not possible, the testing can still be performed accurately.
Half Siblings vs. Unrelated. In these sibling tests the DNA of two, or more, possible siblings, who have different biological mothers, are compared to determine the probability, or likelihood, that they have the same biological parent (usually the father, however we can also test to determine if they share just the biological mother).
If you are testing to determine if you are a half sibling (sharing only one parent) it is helpful to have the mother of one of the alleged siblings submit a DNA sample. If you would prefer to not include the mother’s DNA, we can still perform the testing. Using the DNA of the mother allows us to eliminate the mother’s portion of the DNA from each sibling’s genetic profile. We can then focus only on the other parent’s contribution to the genetic code. Including a mother’s DNA sample may help produce a stronger result in some cases.
There is no additional cost to include one mother’s DNA sample with the initial testing.
Bio-Gene DNA’s home sibling test uses the same standards, and produces the same results as our AABB accredited legal sibling test. We provide this service at the lowest possible cost to help as many people as possible learn the truth.
FAQ’s About A Sibling DNA Test
Yes! It is possible to have a DNA “paternity test” without the father’s direct involvement by using possible or known siblings.
When it is known that both siblings have the same biological mother, then a Full Siblings vs. Half Siblings test should be done. In these sibling tests, the DNA of two individuals with the same biological mother is compared to determine the likelihood that they have the same biological father.
If you know that both suspected siblings do not have the same mother, you would want to order a Half Siblings vs. Unrelated DNA test to show that the siblings either share the same father or are not half siblings.
A mother’s DNA may help provide a stronger result in some cases, and there is no charge for the mother’s DNA if you include it when the samples are sent in prior to testing.
Full siblings share 50% of the same DNA, and half siblings share 25% of the same DNA.
Because of how DNA is passed on, it is possible for two siblings to have some differences at the DNA level. It is even possible for two siblings to get different “ancestry” results from some DNA tests. If the differences are significant however, you may want to consider verifying the sibling relationship.
Yes. In the event of siblings needing confirmation of their biological relationship, researching your family history will only tell you so much. In the absence of the biological parents for testing, the only definitive way to prove a biological relationship is through a DNA sibling test
The standard for sibling testing in the DNA industry is 16 genetic markers. Every marker tested in addition to that increases the power of the results exponentially. Our testing delivers results almost 1,000 times more powerful in the findings that the industry standard.
Each parent (mother and father) contributes 50% of their DNA to their children. When one parent submits a sample for testing, it allows the lab to “subtract out” that parent’s DNA profile and focus only on the remaining parent’s contribution.
If you are seeking to determine if your share the same biological father, the mother’s DNA may be helpful for a stronger result. 97-98% of our cases arrive at a conclusive result without the mother’s DNA. There is no cost to add one mother’s DNA at the time of the original order.
One of the questions we’re sometimes asked is whether or not a sibling test can distinguish between brothers who are both possible fathers.
In this situation the best option is to perform a paternity test between the alleged father and the sibling(s) in question. However, since brothers may share many common DNA markers used in paternity testing, the laboratory may need to perform extra testing.
This is a very common occurance with ancestry type tests. Often you will have a result that shows all of these possibilities at the same time:
- one of you is half-sibling of the other
- one of you is aunt or uncle of the other
- one of you is grandparent of the other
- one of you is double-first-cousin of the other
While some of these can probably be eliminated by your particular circumstances, the only way to validate the true result is to perform a direct relationship test, such as a sibling DNA test, which ancestry companies do not offer.
Like you, your siblings inherited 23 chromosomes from each of your parents. But because of DNA swapping, their chromosomes have a different combination of genes than yours. Yet on average, half of the genes are still the same.
Each parent shares half their DNA to each of their children. Each egg has half of the mother’s DNA and each sperm has half of the father’s DNA. 50% of the DNA is shared by siblings who have the same mother and father, and 25% of the same DNA when they share only one parent.
You can be certain the just because we have lower prices, that the quality of our testing service is the highest available in consumer testing.
We often ask why other companies charge so much for sibling tests. We are able to offer a more accurate sibling test, using more markers, at a lower price for two reasons:
- Part of our Mission Statement as a company is to provide the most accurate DNA testing, at the lowest cost, to as many people as possible because we believe we have a responsibility to help people learn the truth without “breaking the bank”;
- We accomplish this by working with a much smaller margin of profit over thousands of tests each each. We would rather do more tests at a lower cost that take advantage of those needing to have these life changing answers.
Once the lab has all of the samples available for sibling testing, we will have the results for you in ONE business day in almost every single case. We do not charge any extra fees for this service.
How to take a home sibling DNA test
The most accurate method of obtaining your DNA is to use a buccal swab, which is very similar to a “Q-tip” cotton swab. The swabs are rubbed on the inner cheeks of the mouth of those being tested. We provide all the materials needed for the DNA collection in our Bio-Gene DNA Test Kit.
However, we know that sometimes it is not possible to obtain a buccal swab sample. We are often able to test discreet alternative DNA samples. To learn more about non-standard, alternative DNA samples that we can test, CLICK HERE.
How to take a DNA test
How much does a sibling DNA test cost?
A DNA test may well be the most important test you will ever take. We guarantee the highest quality testing at the most affordable prices. We process thousands of DNA samples every year for lawyers, physicians, adoption agencies, and private individuals.
The price for testing includes a Bio-Gene DNA collection kit sent to you by USPS Priority mail, all collection materials, a prepaid mailer for returning your samples, all lab processing fees, and results from our AABB accredited DNA testing lab. If you do not want a kit sent to you for privacy or other reasons, we also allow the option to make your own kit and will email you a case number and step-by-step instructions for collecting and send your DNA samples to our lab for processing.
|Cost||Number of People Testing||Processing Time|
|$149||2 siblings||1 Business Day|
|$159||2 siblings + one mother||1 Business Day|
|+$100||Each additional person||1 Business Day|
|+$100||Non-standard DNA Sample (per sample)||1-3 Business Days|
Need to send a DNA test kit to someone in a different location? No problem!
We can send DNA collection kits to multiple addresses. When ordering, select how many kits you need (one per address is recommended). You will be able to list the names and addresses to send the kits to on the order form. They are each coded with the same case number to be matched in the lab.