So, we have talked about some very important numbers thus far and what they mean to the results of your testing. Today, I want to go over the majority of numbers one sees on their DNA Test results. Genetic systems are the DNA markers that are tested and reported on your DNA Testing results. On each report there are generally sixteen markers displayed. Fifteen of these are used to help determine your DNA Test results.
The names of these systems are listed on the report. An example of one is D2S1338. These names were determined by those that discovered them. Each person has two genes at each marker. On your DNA Test result you will sometimes note that there is only one number listed. This means that at this marker a person has two of the same. For example, if at the D2S1338 a person has two 8s the report will only show it once.
In the case of a DNA Paternity Test the alleged father must match at least one of these numbers at each of the fifteen markers. Without matches at each position he can be excluded as the biological father of the child. As mentioned in an earlier post having the biological mother included with each DNA test will strengthen the results of your test.
The last marker on a DNA Test is the AMEL (short for amelogenin) gene. This is the gene that indicates a person gender. This is not generally related to the actual results of a DNA Test.
I hope this explains a little of how the numbers on our DNA Testing reports work. If anyone has ANY questions please feel free to ask. Also, there is a page on our website with more information on how to interpret results: http://www.dnatesting.com/resources/dnaResults.php.
When you look at a report for DNA Testing there are always a lot of numbers. These numbers throughout the report indicate several things, and it can be overwhelming to figure out which ones are important. As far as understanding your results only two of these numbers will really help you understand the result of your test.
First is the percentage listed as the ‘Probability of Paternity.’ This percentage is generally one of two numbers in a DNA Paternity Test 0% and 99% or higher. This number is probably the most helpful when trying to interpret your DNA Testing results.
In other tests like Siblingship or Avuncular DNA Tests you will not have a percentage in your results. Here the conclusion is based upon an index number which is calculated based on the DNA markers shared by the individuals being tested. This number in this type of testing is anywhere between 0 and basically infinity. When the number is between 0 and 1 it is considered more likely that two people are unrelated. If it is between 1 and 75 the relationship is considered to be favored but still the result is considered inconclusive. If above 75 it is more likely that the individuals are related than not. In this type of testing a result is rarely considered fully conclusive.
In a DNA Paternity Test or a Grandparent DNA test with both grandparents you will also have an index number. This number is generally either 0 or 150 and above. If this number is 0 it is considered an exclusion. If the number is above 150 it means that the alleged father is that many times more likely to be the alleged father than an untested, unrelated, man of the same ethnicity.
Tomorrow I will tell you a little about all the other numbers on your report and how they relate to your results. I know that the reports can be a little difficult to read. I hope that my explanation has shed a little light on the matter, if not tell me and I can break it down a little farther.