Sibling DNA Test

Sibling DNA Test

Full sibling and half sibling tests – Results in 2 days

sibling dna testSibling DNA testing

Sibling DNA testing 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.

A sibling test is normally performed when a standard paternity test is not possible making this test the best way of establishing paternity through the alleged father’s suspected children to see whether they are biologically related to each other.

How accurate is a sibling DNA test?

Our 44 marker sibling DNA test is guaranteed to be the most accurate test available.

We can perform full sibling or half sibling DNA testing in many cases without the DNA of one or both of the mothers due to the fact that we test more genetic markers for a more accurate result with fewer people testing. Our sibling DNA testing is over 10,000 more powerful than the industry standard 16 marker sibling test, based on statistical reliability. While we have the ability to perform the low marker tests that other labs use, we have chosen not to when performing a sibling DNA test due to accuracy issues.

In sibling testing, two or more alleged siblings (either half siblings or full siblings) that are being tested don’t have to share all DNA in common at all the genetic markers being examined, unlike a father and child do. In fact, a full sibling only shares up to 50% of the same DNA as their siblings, and a half sibling only up to 25% of the same DNA. This means that the outcome of a sibling DNA test relies solely on statistics.

How to understand sibling DNA test results

When a DNA test for siblings is conducted, the laboratory will determine the genetic profile of each of the alleged siblings. Based on the type of genetic material exhibited by each person, a sibship index is determined. If the siblingship index is less than 1.00, this indicates non-relatedness. If the sibling index is greater than 1.00, this indicates that the two tested individuals are more likely to be true full sibling or half siblings. The higher the value of the sibling index, the greater the likelihood that the two individuals are true biological brothers and/or sisters. This index is translated in a probability percentage for easier understanding. A probability percentage of 80% or greater is a conclusive result.

How much does a sibling DNA test cost?

DNA Test 

Lab Processing Time

Cost of Test

2 Siblings (Full or Half ) w/o the mother’s DNA 2 -3 business days $249 »
3 Siblings (Full or Half) or 2 Siblings + 1 Mother 2-3 business days $375 »
4 Siblings (Full or Half) or 3 Siblings + 1 Mother 2-3 business days $499 »
5 Siblings (Full or Half) or 4 Siblings + 1 Mother 2-3 business days $625 »


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Home sibling DNA testing

Bio-Gene DNA Testing perform home sibling tests using our the same standards as legal sibling testing. It does not matter if all parties directly participate in the testing, or if you choose to send in discreet alternative DNA samples to learn the truth.

Our full sibling and half sibling at home DNA test provides the exact same results as legal testing. This is due to our insistance of examining a much higher number of markers than the cheaper consumer testing because we want to provide the most accurate sibling DNA test results.

How to do 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 home DNA test kits.

However, sometimes it is not possible to obtain a buccal swab sample. We are often able to test discreet alternative DNA samples. The item containing the DNA should have been stored in a paper envelope or breathable environment without extreme temperature changes for the best results in extracting the DNA. The sample should not have been stored in a plastic bag for any extended period of time.

How to Order a Sibling DNA Test

How it works graphic

To order your Sibling DNA Home Test Kit, please complete the order form by clicking the ORDER NOW button.

If you chose to use a Bio-Gene DNA Testing DNA collection kit, you will recieve detailed collection instructions, buccal swabs, collection enevelopes and a postage paid return mailer. Once your kit is mailed, you will be provided a tracking number to be able to determine when it will arrive.


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What If Those Being Tested Live In Different Cities?

A DNA  test can be easily conducted even if the different parties to be tested are in different cities or even in different countries. Each DNA testing kit is assigned a unique identification number. If the different parties live in different cities or different countries, Bio-Gene DNA esting kits with the unique case number can be sent directly to each party. After collection, each individual can separately send the specimens directly to the DNA laboratory. The DNA specimens will be correctly matched at the DNA laboratory for each case using the unique case number. When ordering online, simply select the option of two or more kits (depending on the number of people testing) on the order form and enter the additional name and address in the box that will automatically show when this selection is made!

Legal “Upgrade” from a Private Home DNA Test

If you are not certain that your DNA test will need to be legally admissible, we offer our clients as special “upgrade” program. If you purchase a home DNA test kit from us, and find out within 60 days of receiving the results that you need a court admissible DNA test, we will credit the amount you paid for our home test, up to $125.00, toward the cost of your legal test. If you find out you don’t need a legal test then this allows you to save the difference. If you do need to have a legal test performed then you will only need to pay the difference between the credit amount and the legal test cost. To upgrade a home DNA test, please contact a Genetic Consultant please call 1-844-246-4363.

If you wish to purchase a legal Sibling test, please click here.

How will I get my sibling DNA test results?

Due to performing our high marker tests, Bio-Gene DNA Testing is able to deliver results that show conclusive results in almost every single case we handle. The testing reports are written in a way this is easy to understand, and we always provide a free consultation on testing results if needed.

Results are emailed to the ordering party in .pdf file as soon as they are released from testing and reviewed for accuracy. Generally the results are available 2-5 business days after that testing has begun. While uncommon, there may be times that an extra 24-48 hours may be needed if the samples require extended testing orspecial treatment. We do not charge extra for extended work or special circumstances. While we never want a delay past our commited time for standard processing, we believe it is worth a short amount of extra work to be certain that the results we deliver to you are the most accurate that can be attained.

learn more half sibling learn more full sibling learn more about legal tests learn about sibling accuracy

If you have questions you can e-mail us at, or you may call one of our Genetic Consultants at 1-844-BIO-GENE (246-4363) to discuss your case confidentially.

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