Grandparent DNA Testing

most accurate grandparent dna test

When an alleged father is not directly able to be tested, at least one of the suspected father’s biological parents can perform a DNA grandparent test to help determine if he is the true father of a child.

We guarantee we provide the most accurate DNA Grandparent test available.

Biological parents equally contribute 50% to their child’s DNA, so that one-half of his DNA comes from each parent. When that child becomes a parent, they in turn contribute half of their DNA to their child. Therefore, 25% of the grandchild’s DNA comes from each grandparent, through their biological child.

Most Accurate Grandparent DNA Test

grandmother grandson test

Grandparent DNA test accuracy

Grandparent DNA testing is based on the statistical probability that two or more people are related by bloodlines as grandparent and grandchild. The industry standard for testing of this type compares 16 alleles to attempt to arrive at the conclusion if a grandparent/grandchild relationship exists.

The challenges and limitations with this approach is that when using so little genetic material, it is very difficult to arrive at a conclusive result because a grandparent only shares up to 25% of the same DNA with their suspected grandchild. All humanity shares 99.9% of the same DNA, which means that only .10% can be used to determine the answer as to whether or not a grandparent/grandchild relationship exists.

When only 16 markers are being considered, there is a very good possibility that an inconclusive result will be reported. Even worse, a false negative or false positive is also a potential outcome. Bio-Gene DNA holds the position that there are just not enough markers tested in a standard test to feel confident about the results.

Bio-Gene DNA wants to provide you with an answer that is 100% accurate. For your peace of mind, and to allow us to help you learn the truth about the relationship, we will only perform grandparent DNA testing using a higher number of genetic markers than the industry standard tests. This is our policy and we follow very strict procedural standards to ensure testing compliance. We guarantee our DNA testing to be at least 1,000 times more powerful than the standard processing occurring today.

Grandparent DNA tests

If both grandparents are available to perform a DNA test with the child, it will be the same as if the biological father was available, because each grandparent contributes 50% of their DNA to their child, who in turn contributes 50% to their child. The mother of the child is not required to test in this situation. The accuracy of this testing is 100%, and is based on the genetic profiles obtained.

If only one grandparent is available to test then we suggest, but do not require, that the mother’s DNA sample be included. Once the DNA profile of the child has been obtained, the mother’s contribution is eliminated for testing purposes and this allows a 100% accurate answer (based on the samples submitted) as to the biological relationship of the grandparent.

Bio-Gene DNA uses up to 50% more alleles than other companies, when the mother or both grandparents are available, to perform the DNA testing.

The DNA sample of the mother can be included at no additional charge.

44 marker grandparent DNA test

There are times or reasons that the other grandparent, or the mother, is not available for the grandparent testing. In order to obtain the most accurate DNA comparison results we will test up to 44 genetic markers. In these cases we test 250% more genetic material than a standard low 16 marker grandparent test. This allows for only one grandparent and one grandchild being tested with 100% accurate results, based on the genetic profiles obtained. Statistically, when testing just two people, the 44 marker results are almost 10,000 times more accurate than the 16 marker tests other labs routinely process. 

Legal upgrade from a private home DNA test

When there is uncertainty as to whether DNA testing results will need to be legally admissible, we offer our clients a special “upgrade” option. Purchase a home DNA test kit from us, and determine within 60 days of receiving the results that you need a court admissible DNA test, and we will credit the amount you paid, up to $125.00, toward the cost of a legal test done through Bio-Gene DNA.

In the overwhelming majority of cases, private testing provides the results that are desired, and there is no further action required.  When other issues arise however, such as probate or estate planning, Social Security issues, or birth certificate name changes, a legal test may be necessary, depending on what the DNA findings show.

If you determine that you don’t need a legally binding, court ready, DNA test result then this allows you to save the difference between the cost of a legal DNA test and the private testing. 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 current legal test cost. To convert from a private DNA test to a legal DNA test, please contact a Genetic Consultant at 1-844-246-4363.

Taking a grandparent DNA test

When ordering a grandparent DNA test you may choose to either use a testing kit purchased from Bio-Gene DNA or make your own DNA collection kit. If you chose to use a Bio-Gene DNA Test Kit, you will receive detailed instructions, buccal swabs, collection containers and a postage paid return envelope. Once your kit is mailed, you will also be provided a tracking number to be able to determine when it will arrive.

Collecting a DNA sample

Our standard DNA test, and the most accurate method of collecting a DNA sample, requires the use of a buccal swab, similar to a “Q-tip” cotton swab, which is rubbed on the inner cheeks of the mouth of those being tested. Mouth swabs are simple to use and yield enough DNA to successfully complete a DNA test.  

We know however, that sometimes it may not be possible to provide an oral swab DNA sample and that a person may wish to test other sources of genetic material. Under these circumstances DNA samples such as hair, a used Kleenex, or a toothbrush known to have belonged to the other person being testing may be able to be used. We are able to test many different alternative samples, at a small extra fee. To learn more about alternate non-standard samples, click HERE.

Grandparent DNA testing results

Due to performing the higher marker tests, Bio-Gene DNA is able to deliver results that provide conclusive results in almost every single case we handle. Results are provided in a PDF file through a secure login to the person ordering the test once they are ready.

When dealing with results, an 80% or greater probability of relationship is commonly accepted as proof for or against blood relationships. In the event that the son of the grandparent(s) being tested was the father of the child, the results show the probability that they are related, or it will show that they are not related.

Our results are clear, understandable, and definite. Testing results are always kept confidential and only shared with the person ordering the test, unless specific instructions have been given to do otherwise.

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 locations, Bio-Gene DNA Test Kits, or Make Your Own Kit forms, each with the unique identification number can be sent directly to each person. After the DNA collection, each individual can separately send the specimens directly to Bio-Gene DNA. The DNA specimens will be correctly matched at the DNA laboratory for each case using this unique case number. When ordering online, 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!   

Cost of a Grandparent DNA Test

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.

Your cost will depend on several factors, with the most important one being who is available to test. Your choices are outlined in the fee schedule below.

In addition, each private test has two options available for DNA sample collection:   

Bio-Gene DNA Test Kit

Purchase a Bio-Gene DNA Test Kit. This kit includes collection materials for up to 3 people, detailed instructions and a prepaid return mailer. Each kit ordered is sent via USPS Priority Mail with 2-3 day delivery. A tracking number will always be provided for your kit.

Cost: $9.95 each.

Make Your Own DNA Kit

You can choose the Make Your Own DNA Kit option. Using cotton swabs (“Q-tips”) you collect your DNA samples.Upon ordering you will be emailed an instruction form that will contain all the information needed, your case number, and the mailing address to send your samples to.

Cost: $0.00.


Grandparent Home DNA Test

  • No additional charge to test the mother’s DNA sample.
  • Results that are fast and accurate using only a high genetic marker count for testing.
  • The lowest price for high marker AABB standard grandpartent test available.
  • A pre-addressed and prepaid return mailer is included with our Grandparent DNA test kit.
  • Discreet and private testing is available and results delivered only to the person ordering.
Number of People Testing Processing Time Cost
One or Two Grandparents, One Child 2-5 Days $199
One or Two Grandparents, Mother, One Child 2-5 Days $199
Each Additional Child 2-5 Days $125