Understanding Home Paternity Test Results: A Step-by-Step Guide
Home paternity testing has become a popular, reliable, and convenient way to confirm biological relationships. With advancements in DNA technology, families can now obtain clear answers to life-changing questions from the comfort of their homes.
If you've taken a home paternity test or are considering one, understanding the results is important. This guide explains what paternity test results look like, how they are interpreted, and what they mean for you and your family.
Quick Answer: How Do You Read Paternity Test Results?
A paternity DNA test report typically contains three key findings:
A Statement of Results
A Combined Parentage Index (CPI)
A Probability of Paternity
A positive result will state that the alleged father cannot be excluded as the biological father.
A negative result will state that the alleged father is excluded as the biological father.
The CPI and Probability of Paternity provide the statistical support behind these conclusions.
In This Article
How paternity DNA testing works
What a positive paternity result looks like
What a negative paternity result looks like
Understanding the Combined Parentage Index (CPI)
Understanding Probability of Paternity
How accurate paternity test results are
Common questions about paternity reports
How Does a Home Paternity Test Work?
A home paternity test analyzes DNA samples from the child, the alleged father, and sometimes the mother.
These samples are typically collected using painless cheek swabs and submitted to the laboratory for analysis.
The laboratory compares specific DNA markers, known as Short Tandem Repeats (STRs), to determine whether the tested individuals share a biological relationship.
Reading Home Paternity Test Results
Your paternity test results will typically contain three important components.
Statement of Results
The Statement of Results provides the laboratory's conclusion.
Positive Result
A positive report will generally include language such as:
"The alleged father cannot be excluded as the biological father of the tested child."
Negative Result
A negative report will generally include language such as:
"The alleged father is excluded as the biological father of the tested child."
Combined Parentage Index (CPI)
The Combined Parentage Index (CPI) is a statistical value used to measure how strongly the DNA evidence supports paternity.
The higher the CPI, the stronger the genetic evidence supporting the biological relationship.
Examples:
CPI of 0 = exclusion
CPI of 100 = evidence supports paternity
CPI of 1,000 or greater = strong support
CPI values often exceed 100,000 in positive paternity cases
The CPI is used to calculate the Probability of Paternity.
Probability of Paternity
The Probability of Paternity expresses the likelihood that the tested man is the biological father based on the DNA evidence.
In most reports:
99% or greater is considered conclusive evidence of paternity
99.99% or greater is common in positive paternity cases
0% indicates exclusion
Example Results: Positive Paternity
Example Positive Paternity Test Result
Example Positive Paternity Test Result
In cases where the alleged father is the biological parent, the CPI value is typically very high, often exceeding 100,000, and the Probability of Paternity will be listed as 99.99% or higher.
This is considered conclusive evidence that the tested man is the biological father.
The report will typically state:
"The alleged father cannot be excluded as the biological father of the tested child."
Example Results: Negative Paternity
Example Negative Paternity Test Result
Example Negative Paternity Test Result
If the alleged father is not biologically related to the child, the CPI value will be 0 and the Probability of Paternity will be listed as 0%.
The report will typically state:
"The alleged father is excluded as the biological father of the tested child."
This indicates there is no genetic evidence supporting paternity.
What If You Haven't Taken a Paternity Test Yet?
Many individuals first review example paternity test results before deciding whether testing is appropriate for their situation.
Understanding what a DNA report looks like in advance can help reduce uncertainty and make the testing process easier to understand.
A home paternity DNA test uses simple cheek swab samples and can provide answers regarding biological relationships with a high degree of accuracy.
Common Questions About Paternity Test Results
How Accurate Are Paternity Test Results?
Paternity tests performed by accredited laboratories are highly accurate.
Positive results typically exceed 99.99% Probability of Paternity, while exclusions provide clear evidence that the tested man is not the biological father.
Learn more: Paternity DNA Testing Explained
Do I Need the Mother's DNA?
No.
The mother's sample is not required for most paternity tests.
However, including the mother's DNA can provide additional information and may simplify interpretation in certain cases.
Learn more: DNA Testing without the Father
What Does "Cannot Be Excluded" Mean?
This means the DNA evidence supports that the tested man may be the biological father.
The accompanying statistical calculations determine how strongly the evidence supports paternity.
What Does "Excluded" Mean?
An exclusion means the DNA evidence shows that the tested man is not the biological father of the child.
Can a Paternity Test Be Wrong?
Modern DNA paternity testing is highly accurate when samples are properly collected and analyzed.
Results are based on the comparison of multiple genetic markers and established statistical calculations.
Why Choose Validity Genetics for Home Paternity Testing?
At Validity Genetics, we prioritize accuracy, confidentiality, and customer support.
Our reports are designed to be easy to understand while providing the detailed information needed to interpret your results confidently.
Fast Turnaround
Results are often available within a few business days after samples arrive at the laboratory.
Accurate Results
Advanced DNA testing technology provides highly reliable results.
Supportive Team
Our team is available to answer questions before, during, and after testing.
Understanding Your Paternity DNA Results
Paternity DNA test results provide scientific evidence regarding biological relationships. By understanding the Statement of Results, Combined Parentage Index, and Probability of Paternity, you can better interpret your report and understand what the findings mean.
Whether your results indicate inclusion or exclusion, understanding how the conclusions are reached helps provide clarity and confidence in the testing process.
Related Services
Home Paternity DNA Test
Home Paternity DNA Test includes:
Easy to follow instructions
2 sterile buccal collection swabs per person
Sample envelopes for each person involved
Consent form
Prepaid return label to our laboratory. (USA Only)
Select from test options below:
Related Articles
Example Paternity Test Results
https://validitygenetics.com/news/example-paternity-test-results
Paternity DNA Testing Explained
https://validitygenetics.com/news/paternity-dna-testing-explained
DNA Testing without the Father
https://validitygenetics.com/news/dna-testing-without-the-father
How Accurate are Paternity Tests?
https://validitygenetics.com/news/how-accurate-are-paternity-tests
Cited References:
American Association of Blood Banks (AABB)
https://www.aabb.orgNational Human Genome Research Institute. DNA and Genetic Testing
https://www.genome.govNational Institute of Justice. DNA Evidence Basics
https://nij.ojp.gov/topics/articles/dna-evidence-basics
