What Do Paternity Test Results Look Like?
When people receive the results of a paternity test, they often want to know how to interpret the information provided in the report. DNA test reports contain several scientific terms and statistical values that help determine whether the tested individual is the biological father of the child.
Although the format of reports may vary slightly between laboratories, most paternity test results contain similar types of information.
Understanding the structure of a typical report can make it easier to interpret the results correctly.
If you would like a full overview of the testing process, you can review our complete guide to paternity DNA testing.
What Information Is Included in a Paternity Test Report?
Most paternity test reports include several key components that help explain the results.
Common sections include:
• Identification of participants
• DNA marker comparison tables
• The Combined Paternity Index (CPI)
• The Probability of Paternity
• The final conclusion of the test
Each of these components helps scientists determine whether the alleged father shares the necessary genetic markers with the child.
Example of a Positive Paternity Test Result
When the tested man is the biological father, the report will usually show a very high probability of paternity, typically 99.9 percent or greater.
In these cases, the DNA markers tested between the child and the alleged father match in the expected pattern.
Below is a space where you can include an example image of a positive paternity test report.
The report will usually contain a conclusion similar to the following:
"The tested individual is not excluded as the biological father of the tested child. The probability of paternity is 99.9% or greater."
This indicates strong genetic evidence that the tested man is the biological father.
Example of a Negative Paternity Test Result
If the tested man does not share the required genetic markers with the child, the report will show a probability of paternity of 0 percent.
In this situation, multiple DNA markers will show mismatches that cannot be explained by normal genetic variation.
Below is a space where you can include an example image of a negative paternity test report.
The report conclusion may state something similar to:
"The tested individual is excluded as the biological father of the tested child."
Because DNA markers must match in specific ways between parent and child, exclusions are usually very clear.
Understanding the DNA Marker Table
Many paternity test reports include a table comparing DNA markers between participants.
Each marker represents a specific location in the DNA where genetic values can vary between individuals.
The child must inherit one value for each marker from the biological father. If the tested man shares those values, the markers support paternity.
When several markers fail to match, the alleged father is excluded.
What Is the Combined Paternity Index?
The Combined Paternity Index (CPI) is a statistical value calculated by analyzing all tested DNA markers together.
Each matching marker increases the strength of the statistical evidence.
The CPI is then used to calculate the probability of paternity, which is the percentage most people focus on when reviewing their results.
If you would like a deeper explanation of this calculation, see our article on what probability of paternity means.
Are Home Paternity Test Results Reliable?
Home paternity test results can be highly reliable when samples are collected properly and analyzed by an accredited laboratory.
The DNA comparison process used in home testing is the same scientific method used in legal paternity testing.
However, because home samples are collected privately, the results are typically intended for personal knowledge rather than legal use.
You can learn more about how reliable these tests are in our article on how accurate a home paternity test is.
When Are Legal Results Required?
If paternity results will be used in court or for official documentation, the testing must follow strict procedures.
Legal paternity testing includes:
• Verified identification of participants
• Supervised DNA sample collection
• Documented chain of custody
These safeguards ensure the results are admissible in legal proceedings.
For more details, see our guide to legal paternity testing.
Final Thoughts
Paternity test reports contain scientific data that helps determine whether a biological relationship exists between a child and an alleged father. Although the details may appear complex at first, the final conclusion of the report clearly states whether paternity is confirmed or excluded.
Understanding the basic structure of the report can make it easier to interpret results and understand what the numbers mean.