Today, DNA testing can be used for much more than determining whether someone is biologically related to another person.

Depending on the type of test, your DNA can provide information about biological relationships, inherited genetic conditions, ancestry and, in some cases, your risk of developing certain health conditions.

But there is also a lot of confusion around what DNA tests can and cannot actually tell you.

Can a DNA test tell you whether you will develop a disease?
Can it tell you where your ancestors came from?
How accurate is a paternity test?
What sample do you need to provide?
And how is genetic testing different from a standard DNA test?

If you’re considering DNA testing in Nigeria, here’s what you need to know.

What is a DNA test?

A DNA test examines genetic material from your cells to identify particular genetic information.

DNA, or deoxyribonucleic acid, contains the biological instructions that help determine how your body develops and functions. You inherit DNA from your biological parents, which is why comparing specific genetic information between people can help establish biological relationships.

Different DNA and genetic tests examine different parts of this information.

Some tests are designed to answer a very specific question, such as:

Is this person the biological father of this child?

Others examine genetic variants associated with health conditions, while ancestry tests can provide clues about a person’s genetic ancestry and relationships.

So there isn’t really one universal “DNA test.”

The right test depends on the question you want the test to answer.

What can a DNA test tell you?

DNA testing can be used for several different purposes.

The most common include:

Paternity and other relationship testing
Genetic health testing
Ancestry and genealogy
Carrier testing
Prenatal and newborn testing
Forensic identification

Let’s look at each one.

1. Paternity testing

This is probably the type of DNA test most people are familiar with.

A paternity test compares the DNA of a child with that of an alleged biological father to determine whether there is a biological relationship.

Because children inherit genetic material from both biological parents, laboratories can compare specific DNA markers between the people being tested.

A paternity test can therefore provide strong evidence for or against biological paternity.

Paternity testing is generally performed using a sample from the child and alleged father. Depending on the laboratory and circumstances, additional participants, such as the biological mother, may also be tested.

Peace-of-mind vs legal paternity testing

One important distinction is whether you need the result for personal information or for an official legal purpose.

A private or “peace-of-mind” test may be suitable when someone simply wants to know the biological relationship.

A legal DNA test involves additional identification and sample-collection procedures designed to establish who provided each sample and maintain the integrity of the testing process.

If the result may be used for court, immigration or another official process, ask the testing provider specifically for a legally admissible test rather than assuming any DNA test will be accepted.

2. Genetic health testing

Some genetic tests look for changes in genes that may be associated with particular health conditions.

Depending on the test, genetic testing can help:

confirm or rule out certain inherited conditions
identify whether someone carries particular genetic variants
estimate the risk of developing certain conditions
provide information that may help guide medical care
help families understand the possibility of passing certain genetic conditions to their children

Genetic testing can involve analysing a single gene, several genes, chromosomes or much larger portions of a person’s genetic material.

However, this is where it’s important to be careful with what a genetic test result actually means.

A genetic variant associated with a disease does not automatically mean you will develop that disease.

For many conditions, genetics is only one part of the picture. Other genetic factors, environment and lifestyle can also influence whether a condition develops.

That’s why genetic test results should be interpreted in the context of your medical and family history, preferably with guidance from an appropriate healthcare professional.

3. Ancestry and genealogy testing

Ever wondered where your ancestors came from?

Some DNA tests analyse genetic markers to provide estimates about ancestry and identify genetic relationships with other people in a database.

An ancestry test may provide information about:

genetic ancestry
geographic regions associated with your ancestry
potential biological relatives
genetic connections between family lines

However, ancestry results are estimates, not a literal map of every place your ancestors lived.

Different testing companies may produce different ancestry estimates because they use different reference populations, databases and analytical methods.

So if a report says you are a certain percentage from a particular region, it shouldn’t be interpreted as a complete historical record of your family’s origins.

4. Carrier testing

A person can carry a genetic variant associated with a particular inherited condition without having the condition themselves.

Carrier testing is designed to identify some of these variants.

This can be particularly relevant when people are planning to have children.

If both partners carry certain variants associated with the same recessive genetic condition, there can be an increased chance that their child will inherit the condition.

This is one reason genetic counselling and appropriate medical advice can be useful when interpreting genetic test results.

Genetic testing can provide information for family planning, but the meaning of a particular result depends on the specific condition and the variants involved.

5. Prenatal and newborn genetic testing

Some genetic testing can be performed during pregnancy or shortly after birth.

Prenatal testing can be used to look for certain genetic or chromosomal conditions, while newborn screening can identify certain conditions early in life.

There are also prenatal paternity tests, which are specifically designed to investigate biological paternity during pregnancy.

These should not be confused with prenatal genetic screening.

The two tests answer different questions.

If you’re considering any genetic or DNA test during pregnancy, speak with an appropriate healthcare professional first so you understand what the test involves, its limitations and what the results could mean.

6. Forensic DNA testing

DNA can also be used to identify individuals for forensic purposes.

Forensic DNA analysis may be used in situations such as identifying people after disasters, investigating crimes or establishing biological relationships.

This type of testing is different from consumer genetic testing because its purpose and handling requirements are different.

How does DNA testing work?

The process is usually simpler than people expect.

Step 1: A sample is collected

Depending on the test, the sample may come from:

a cheek swab
blood
saliva
hair
other tissue
or, in specific circumstances, other biological material

A cheek swab is commonly used for relationship DNA testing because it is simple and non-invasive.

Step 2: The sample goes to a laboratory

The laboratory extracts and analyses genetic material from the sample.

The exact laboratory process depends on the type of test being performed.

Step 3: The laboratory analyses the relevant genetic information

The laboratory looks for specific genetic markers or variants relevant to the test.

A paternity test, for example, is looking at genetic information relevant to establishing a biological relationship.

A health-related genetic test may instead look for particular genetic variants associated with a condition.

Step 4: You receive a report

The laboratory provides a report explaining the findings.

The format and level of detail can vary significantly depending on the test.

For health-related genetic testing, results may require professional interpretation because a genetic result is not always as simple as “positive” or “negative.”

How accurate are DNA tests?

DNA testing can be highly accurate, but accuracy is not one universal number for every DNA test.

The reliability of a test depends on factors including:

the type of test
the laboratory
the genetic markers being analysed
the quality of the sample
the purpose of the test
how the results are interpreted

For genetic health testing, two important concepts are analytical validity and clinical validity.

Analytical validity asks whether the test can accurately detect the genetic variant it is looking for.

Clinical validity asks whether that genetic finding is actually associated with the health condition or characteristic being investigated.

This distinction matters because detecting a genetic variant and understanding what that variant means are two different things.

How much does a DNA test cost in Nigeria?

There isn’t one standard price for DNA testing in Nigeria.

The cost can vary depending on the type of test, number of people being tested, sample collection method, turnaround time, laboratory and whether the test needs to meet legal or immigration requirements.

For example, current Nigerian providers list substantially different prices for private paternity testing, legal testing, relationship testing and prenatal testing.

That means you should be cautious about websites claiming that “a DNA test costs exactly ₦X in Nigeria.”

Instead, ask the provider:

What type of DNA test do I need?
How many people need to be tested?
Is sample collection included?
How long will the results take?
Is the test legally admissible?
Are there additional charges?
How will I receive my results?

If you’re comparing providers, make sure you’re comparing the same type of test rather than simply choosing the cheapest advertised price.

What is the difference between a DNA test and a genetic test?

The terms are sometimes used interchangeably, but they don’t always mean exactly the same thing.

DNA testing is a broad term that can refer to tests examining genetic material for purposes such as relationship testing or identification.

Genetic testing often refers specifically to analysing genes, chromosomes or genetic variants to provide information about inherited conditions, disease risk or other biological characteristics.

For example:

Paternity test:
“Is this person biologically related to this child?”

Genetic health test:
“Does this person have a genetic variant associated with a particular condition?”

Ancestry test:
“What can this person’s genetic information tell us about their ancestry?”

The underlying material is DNA, but the questions being asked are different.

Can a DNA test predict your future health?

Not exactly.

Some genetic tests can identify variants associated with an increased risk of certain diseases.

But an increased genetic risk does not mean that a person is guaranteed to develop the disease.

Similarly, receiving a negative result for a particular genetic variant doesn’t mean you are guaranteed never to develop the condition.

Genetic test results are best understood as one piece of information that may need to be considered alongside your family history, medical history and other risk factors.

This is particularly important when considering tests marketed as broad “health” or “wellness” assessments.

What should you consider before taking a DNA test?

DNA contains deeply personal information, so choosing a testing provider deserves some thought.

Before submitting a sample, consider asking:

1. What exactly is the test looking for?

Don’t assume that every DNA test provides the same information.

2. Who will have access to your results?

Ask how your genetic data and test results will be stored and who can access them.

3. How will the sample be handled?

Find out whether the sample will be destroyed, stored or used for additional purposes.

4. Is the laboratory properly qualified for the type of test?

The requirements for a medical genetic test, a private relationship test and a legally admissible test may differ.

5. Will someone explain the results?

For medical genetic testing, understanding the result can be just as important as obtaining it.

6. What happens if the result is unexpected?

DNA testing can sometimes uncover information that people were not expecting, including unexpected biological relationships or previously unknown health risks.

Think about this before testing, not only after receiving the result.

Is DNA testing worth it?

That depends on what you want to find out.

If you’re trying to establish a biological relationship, a relationship DNA test may provide the answer you’re looking for.

If you’re exploring a possible inherited health condition, a clinically appropriate genetic test may provide useful information for you and your healthcare provider.

If you’re interested in your ancestry, an ancestry test may provide clues about your genetic background.

The important thing is to choose a test based on the question you actually want answered.

Final thoughts

DNA testing can answer some fascinating questions about who we are, where we come from and how we are biologically related to other people.

But DNA isn’t a crystal ball.

A good DNA test doesn’t tell you everything about your life. It provides specific information based on the genetic markers or variants being analysed.

That’s why the most important question to ask before testing isn’t simply:

“How much does a DNA test cost?”

It’s:

“What question am I trying to answer?”

Once you know that, you can choose the appropriate type of test, understand what the results can realistically tell you and make better decisions about what to do next.

Need help understanding your healthcare options? MyItura connects people with healthcare services and financing options designed to make accessing care easier.

Frequently Asked Questions

What is a DNA test used for?

DNA tests can be used for several purposes, including establishing biological relationships, genetic health testing, ancestry research, carrier testing and forensic identification. The specific information provided depends on the type of test.

How is a DNA sample collected?

Many DNA tests use a cheek swab because it is simple and non-invasive. Other tests may use blood, saliva or other biological samples depending on the test.

How much is a DNA test in Nigeria?

There is no single price. Costs vary according to the type of DNA test, number of participants, laboratory, collection method, turnaround time and whether the test is for legal or personal use. Current Nigerian provider listings show significant variation.

Can a DNA test tell me if I will get a disease?

Some genetic tests can identify variants associated with an increased risk of certain diseases, but an increased genetic risk does not necessarily mean you will develop the disease. Results should be interpreted in context.

Can DNA testing determine ancestry?

Some genetic tests can provide estimates about ancestry and identify potential genetic relationships. However, ancestry reports are estimates based on the reference populations and methods used by the testing company.

Is a private paternity test the same as a legal DNA test?

Not necessarily. A legal test generally requires additional procedures to verify the identity of participants and maintain documented sample handling. If you need the result for court, immigration or another official purpose, confirm with the testing provider that you’re purchasing the appropriate legal test.

Should I take a genetic test without speaking to a healthcare professional?

That depends on the type of test. For medical or health-related genetic testing, discussing the purpose and potential implications with an appropriate healthcare professional can help you understand whether testing is appropriate and how to interpret the results.