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In situations where the alleged father is unavailable for testing (e.g. alleged father is deceased or unwilling to participate), the alleged father’s parents can be tested to determine whether they are the true biological grandparents of the child. When conducting a grandparentage test, it is recommended to test both grandparents (the grandmother and the grandfather) in order to obtain the most conclusive results. If this is not possible, a grandparentage test can be conducted by testing only one grandparent.

 
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The grandparentage test is not as powerful as the paternity test and as a result, you should proceed with grandparentage testing only if it is impossible to conduct a paternity test (e.g. alleged father deceased, or unavailable for testing.). Please read the information below to understand the benefits and limitations of grandparentage testing before proceeding.


  Testing the grandmother, grandfather, and the grandchild:  
 

When both grandparents are available for testing, there is a higher chance that you will receive informative results. When both of the alleged father’s parents are available for testing, the laboratory will examine the genetic profile of both grandparents and then use the genetic information of the grandparents to reconstruct the genetic information of the missing alleged father. Once the alleged father’s genetic information is reconstructed, a paternity analysis will be conducted by comparing the reconstructed genetic information for the missing alleged father against the genetic information of the child.

This test may detect when the grandparents are not the true biological grandparents of the child and has a high probability of providing informative results, even when the alleged father is not available for testing.

 
  Testing only one grandparent and the grandchild:  
 

In some situations, only one grandparent is available for testing. When only one grandparent is tested, the missing alleged father’s genetic information cannot be fully reconstructed. In such situations, the laboratory will test the single grandparent and the grandchild and then compare their genetic information. Based on the type of genetic material expressed by each individual, the number of genes which are shared, and the pattern of expression of the genetic material, the laboratory will be able to perform a statistical analysis to generate the “grandparentage index”. If the grandparentage index is less than 1.00, this indicates that it is more likely that the grandparent and grandchild are not related. However, if the grandparentage index is greater than 1.00, this indicates that it is likely that the grandparent is biologically related to the grandchild.

This type of test is conducted when only one of the two grandparents is available for testing, and is not as powerful as testing both grandparents. Although there is a greater possibility when testing only one grandparent that a conclusive answer cannot be obtained, this test may be able to provide you with an indication of whether the grandparent is more likely to be or not to be the true biological grandparent of the child.

To proceed with grandparentage testing, please contact our laboratory at 800-966-210 or fill in the online form.

 


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If you have a special request (e.g. split kit for testing in two different cities, discreet shipping etc.) or if you are in a special situation, contact us at 800-966-210 and our technical staff will be able to assist you.
 
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Step 1 - Order the test
 

To proceed with Grandparentage testing, you can choose to proceed immediately online or click here to download our requisition forms (in pdf format) and send them in by fax or mail. The kit can also be ordered by calling our laboratory at 800-966-210. Once you order the Grandparentage test, a sample collection kit will immediately be sent to the address that you have specified for sample collection.

Step 2 - Collect the samples
 

The Grandparentage Test kit contains all of the materials and step-by-step instructions to collect a buccal swab sample from the parties involved in the test. The DNA sample is collected by gently rubbing a soft swab inside the mouth against the cheek for 10 seconds.

Step 3 - Submit the samples to the laboratory for testing
 
After sample collection, the swabs are returned to the laboratory using the return package enclosed in the testing kit.
Step 4 - Wait for results
 
Once our laboratory receives the samples, testing begins immediately and results are available 3 to 5 days from the day that we receive the samples. You may call our laboratory using your file number and password to obtain your results over the telephone, or you may check your results online. The formal documents will follow by mail and / or E-mail (this is specified when you order your test.)

 

 

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  Applications of Grandparentage Test  
 
Situations where the alleged

father is unavailable for testing.

Comparison of grandmother with
 

grandchild.

Comparison of grandfather with
 

grandchild.

Reconstruction of alleged father's
 

DNA profile by testing both of his parents.

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