If you plan to conduct a grandparent dnatest with PaternityUSA, many questions may cross your mind. They often arise from knowing too little about the matter. Therefore, understanding this concept more could answer questions related to the matter. Luckily, you can learn quite a lot from this particular article. So, read on as we unveil the facts about this particular paternity test.

When Should You Opt for a Grandparent Paternity Test?

Always remember that a paternity test involving the child in question and the alleged father is the best. However, a grandparent paternity test is your best option if the father can’t be present for the test.

Which Samples will be collected?

A grandparent test kit will do well with the buccal swab. It involves collecting cheek dna samples with a cotton swab. That said, some testing will be conducted using blood samples.

Types of Grandparent DNA Tests

These tests are divided into two major categories.

  1. Dual Grandparent DNA Test

As the name suggests, the test involves both the grandmother and grandfather. The sample of the alleged grandchild is also corrected, and a comparison is conducted. It is considered the best grandparent dna test as it increases the chances of a strong and right conclusion being drawn from the results. Since the samples are from both grandparents, scientists will have more relevant DNA markers to work with. Consequently, they will receive conclusive results that easily prove whether there is a biological relationship between the involved parties.

  • Single Grandparent DNA Test

This test involves either the alleged grandfather or grandmother. As much as it is not as good a duo grandparent test, it could be your only option. After all, one of the grandparents may not be available for the paternity test. If that’s the case, don’t forget to include the dna sample of the biological mother as well. With all three samples available, the chances of getting conclusive results increases.

What is the percentage of DNA that comes from a grandparent?

During a dna testing between grandparents and a grandchild, the average percentage of their DNA is usually 25%. That’s because a grandchild gets 25% of genes from every grandparent. It explains why you may sire a kid who resembles your parent. Additionally, it is an explanation of why a grandparent’s DNA is an option when proving paternity.

How Accurate is a Grandparent DNA Test

As long as you conduct a grandparent paternity test correctly, the accuracy will be impressive. In most cases, espec\ially when both grandparents are available, the accuracy is usually up to 99%. That may not be the case when dealing with a grandmother or grandfather alone, but experts will always get the right results depending on the circumstances.


I believe that you have learned a lot about the grandparent DNA test. In addition to the test involving grandparents and grandchildren, there are other facts that you now know. They include the accuracy of the paternity test and the samples that may be required. You also know when it is the best option and the various types at your disposal.

By Blakely