How to Understand Your Paternity DNA Test Results | My Forever DNA
How to Understand Your Paternity DNA Test Results
A clear, supportive guide to reading your paternity DNA test report.
Your paternity DNA test report may include scientific terminology, statistical language, and legal wording that can feel confusing at first glance.
This guide explains the most important parts of a paternity test report, including the conclusion statement, probability of paternity, Combined Paternity Index, and DNA marker table.
Important note: This article uses a paternity test results example for educational purposes only. It is not your actual DNA test report and should not be used as legal, medical, or court advice.
Key Takeaways About Paternity Test Results
If you only remember a few things from your report, start here.
“Cannot Be Excluded” Supports Paternity
If your report says the alleged father cannot be excluded and shows a high probability of paternity, the DNA evidence supports that he is the biological father.
“Is Excluded” Means Paternity Is Not Supported
If your report says the alleged father is excluded, the tested man’s DNA does not match the child’s DNA in the way required for a biological father-child relationship.
The CPI Is the Statistical Backbone
The Combined Paternity Index, or CPI, shows how strongly the DNA evidence supports paternity compared to a random unrelated man.
The DNA Marker Table Shows the Evidence
The allele table shows how the child’s DNA markers compare with the alleged father’s markers.
At-Home Results Are for Personal Knowledge
If results are needed for court, custody, child support, immigration, or other official purposes, a legal chain-of-custody DNA test is required.
What Do Paternity Test Results Mean?
The most important part of a paternity DNA test report is the conclusion statement. This is where the laboratory explains whether the DNA evidence supports a biological father-child relationship.
“The Alleged Father Cannot Be Excluded as the Biological Father”
This means the DNA evidence supports that the tested man is the biological father. The wording may sound cautious, but it is standard scientific language used in paternity testing.
“The Alleged Father Is Excluded from Paternity”
This means the tested man is not supported as the biological father based on the DNA comparison. The child’s DNA does not match the alleged father’s DNA at the required markers.
If you only read one part of your paternity test report, read the conclusion first. The data table, CPI, and probability percentage are the scientific details used to support that conclusion.
What Does a Positive Paternity Test Result Look Like?
A positive result is also called an inclusion. This means the tested man cannot be excluded as the biological father based on the DNA evidence.
Example paternity DNA test report image for educational reference only.
Conclusion Statement
The report may say the alleged father cannot be excluded as the biological father of the child.
High Combined Paternity Index
A high CPI means the DNA evidence is much more consistent with paternity than with a random unrelated man.
High Probability of Paternity
A probability of paternity at or above 99.99% is commonly treated as a conclusive scientific confirmation by accredited laboratories when supported by the full DNA analysis.
Why Does the Report Say “Cannot Be Excluded” Instead of “Is the Father”?
This is one of the most common questions people have after reading a positive paternity test result.
DNA laboratories use the phrase “cannot be excluded” because paternity testing is expressed through statistical probability. The lab compares the alleged father’s DNA to the child’s DNA and calculates how strongly the evidence supports a biological father-child relationship.
Because a laboratory cannot test every other man in the world, the result is not written as a literal 100% statement. Instead, a positive result is reported as a probability, such as 99.99% or higher.
Plain-English meaning: When your report says the alleged father cannot be excluded and the probability of paternity is 99.99% or higher, the DNA evidence supports that he is the biological father.
What Does a Negative Paternity Test Result Look Like?
A negative result is called an exclusion. This means the DNA evidence does not support the tested man as the biological father.
Conclusion
The report may state that the alleged father is excluded from paternity.
Combined Paternity Index
The CPI is typically reported as 0 when the tested man is excluded.
Probability of Paternity
The probability of paternity is reported as 0.00% when the DNA evidence rules out the alleged father.
An exclusion result is based on mismatches across the DNA marker table. Accredited laboratories review results carefully before releasing a report.
How to Read the DNA Marker Table
The DNA marker table is the technical part of your paternity test report. It shows the DNA comparison between the tested participants.
Example allele data table for educational reference only.
Each row in the table represents a DNA marker, also called a locus. At each marker, the lab compares the child’s alleles with the alleged father’s alleles.
| Report Term | What It Means |
|---|---|
| Marker or Locus | A specific location on the DNA that the lab analyzes for relationship testing. |
| Allele | A genetic value found at a marker. A child inherits one allele from the mother and one from the biological father. |
| Alleged Father Column | The two allele values belonging to the tested man at that marker. |
| Child Column | The child’s allele values at that same marker. |
| PI Column | The Paternity Index for that specific marker. |
For paternity to be supported, the child must share the expected paternal allele pattern with the alleged father across the DNA markers tested. The full statistical calculation, not one row alone, determines the final result.
What Is the AMEL Row?
The AMEL row, also called the amelogenin marker, is typically used as a sex-identification marker. It does not calculate the probability of paternity.
X, X
Usually indicates a female DNA profile.
X, Y
Usually indicates a male DNA profile.
The PI column for AMEL may show N/A because it is not used in the paternity index calculation.
What Is the Combined Paternity Index?
The Combined Paternity Index, often shortened to CPI, is one of the most important statistics on your paternity test report.
The CPI explains how much more likely it is that the tested man is the biological father compared with a random unrelated man from the relevant population group.
Each Marker Gets a PI
The lab calculates a Paternity Index for each DNA marker.
The PI Values Are Combined
The individual marker values are combined to create the CPI.
The CPI Supports the Probability
The CPI is used to calculate the final Probability of Paternity shown on the report.
What Does 99.99% Probability of Paternity Mean?
The Probability of Paternity is the percentage many people look at first. It turns the lab’s statistical analysis into a more familiar number.
A probability of 99.99% or higher means the DNA evidence strongly supports that the tested man is the biological father. A probability of 0.00% means the tested man is excluded.
A paternity report will not usually say 100% because DNA testing is expressed as a statistical probability. In practical terms, 99.99% or higher is considered scientifically conclusive when supported by the full report.
Can There Be a Mismatch and Still Confirm Paternity?
Yes. A small number of marker differences can sometimes occur because of natural genetic mutation. This does not automatically mean the tested man is excluded.
Qualified laboratories evaluate the full pattern across all markers, not just one row. If one or two markers show a possible mutation but the overall DNA evidence strongly supports paternity, the lab may account for mutation in the statistical calculation.
If multiple markers show mismatches across the report, the result may be an exclusion. The final conclusion is based on the full analysis performed by the laboratory.
Does the Mother’s DNA Sample Change the Results?
A mother’s DNA sample is not always required for an at-home paternity DNA test. The child’s DNA can be compared directly to the alleged father’s DNA.
However, including the mother’s sample can sometimes strengthen the analysis because the lab can identify which alleles came from the mother and which alleles must have come from the biological father.
Helpful for Complex Cases
Including the mother may be helpful when possible fathers are related or when additional clarity is needed.
Not Always Required
Most standard father-child paternity tests can still produce clear results without the mother participating.
If you are unsure whether including the mother would help your case, contact My Forever DNA® before sending your samples.
What If Two Possible Fathers Are Brothers or Close Relatives?
This is an important detail to disclose before testing. Close male relatives, such as brothers or a father and son, can share more DNA than unrelated men. That can make the analysis more complex.
If two possible fathers are related, tell My Forever DNA® before samples are collected. The lab may recommend additional testing steps, additional participants, or a different testing setup.
Test More Than One Possible Father
Testing both possible fathers can help the lab compare the DNA evidence more directly.
Consider Including the Mother
The mother’s sample may help separate maternal and paternal alleles more clearly.
Use Multi-Location Testing if Needed
If participants live in different places, a multiple-location paternity DNA test can help make sample collection easier.
Understanding the Other Sections of Your Report
Beyond the conclusion, data table, CPI, and probability percentage, your report may include administrative sections that help identify and organize your case.
Report ID and Order ID
These numbers help connect your results to the correct laboratory case and My Forever DNA® order record.
Participant Information
This section may list the participants, relationship labels, collection date, sample type, and case information.
Verification and Review
DNA test reports are reviewed before release. Legal DNA testing also requires proper chain-of-custody documentation.
Privacy, Support, and Real Human Guidance
Paternity DNA testing can bring up emotional questions. My Forever DNA® is built around privacy, clarity, and support from real people, not confusing portals or barcode activation systems.
Results are delivered privately after laboratory processing and review are complete, and our team is here to help explain the process in a calm, respectful way.
To learn more about our privacy-first approach, review our Trust & Transparency Statement or visit our Laboratory, Accreditation & Trust page.
Need a Different DNA Testing Option?
Every family situation is different. My Forever DNA® offers multiple private relationship DNA testing options to help customers choose the best fit.
Frequently Asked Questions About Paternity Test Results
Can a paternity test result be wrong?
When processed by an accredited laboratory using proper procedures, paternity DNA testing is highly reliable. The most important issue to disclose before testing is whether two possible fathers are close relatives, such as brothers, because that can make the analysis more complex.
What are blank or inconclusive DNA results?
In rare cases, the lab may not obtain enough usable DNA from a submitted sample. This can happen if a sample contains too few cells, has degraded, or was not collected or stored properly. A new sample may be needed.
What should I do if my results are different from what I expected?
Unexpected results can feel emotional. If your results are not what you anticipated, you can contact My Forever DNA® for help understanding the report and discussing possible next steps.
Is an at-home paternity test valid in court?
No. At-home paternity DNA tests are intended for personal knowledge only. For court-admissible results, including custody, child support, immigration, or other legal matters, a legal chain-of-custody DNA test is required.
How long does it take to get paternity DNA test results?
Turnaround time may vary by test type, shipping speed, sample return timing, and laboratory processing. Many standard paternity results are completed within a few business days after all required samples are received and accepted by the laboratory.
Will anyone else see my results?
Your results are handled privately and are not uploaded into public genealogy databases. Review the My Forever DNA® Trust & Transparency Statement and Privacy Policy for more details about how information is handled.
What does “cannot be excluded as the biological father” mean?
It means the DNA evidence supports that the tested man is the biological father when paired with a high probability of paternity. The phrase is standard scientific wording used in paternity testing reports.
What does “the alleged father is excluded as the biological father” mean?
It means the DNA evidence does not support the tested man as the biological father. An exclusion result typically shows a 0.00% probability of paternity and a CPI of 0.
What is a paternity test results example?
A paternity test results example usually includes a conclusion statement, DNA marker table, Combined Paternity Index, Probability of Paternity, participant details, and laboratory review information. The examples in this guide are for educational reference only.
You Do Not Have to Interpret Your Results Alone
If any part of your paternity DNA test report feels unclear, My Forever DNA® is here to help you understand the process with privacy, compassion, and real human support.
Reply to the email from your dedicated DNA Specialist, call us directly, or contact our team online.
Important Disclaimer
This article is for educational purposes only and is not legal, medical, or court advice. My Forever DNA® at-home DNA testing products are intended for informational relationship testing unless a legal chain-of-custody DNA test is specifically purchased. Informational at-home DNA test results are not intended for legal or court-admissible use. DNA testing products are not medical devices and are not intended to diagnose, treat, prevent, or assess any medical condition. Sample viability may vary depending on the type, age, condition, and handling of the sample.
