DNA test selection guide
Which DNA Test Do I Need? A Complete Guide to Choosing the Right DNA Test
You do not need to understand DNA terminology before asking for help. Start with the family question, the people who can take part, and how the report will be used.
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In This Guide
Start with your situation
Don't worry about the test name yet. Start with three simple questions.
Plain answers to these questions are usually enough to identify the right direction.
1. What are you trying to find out?
- “Is this man the child's biological father?”
- “Is this woman my biological mother?”
- “Do we share both parents?”
- “The father has died. Can we still connect the child to his family?”
2. Who is available for testing?
- The possible father can participate.
- He cannot, but his parents can.
- He has died, but his full brother can.
- Several relatives from the same family are available.
3. What will the results be used for?
- Private knowledge or peace of mind
- Court, legal counsel or an estate
- Canadian or U.S. immigration
- Another government or official purpose
Quick decision guide
30-Second DNA Test Guide
Find the sentence closest to your situation. This is a starting point, not a substitute for reviewing an unusual family case.
I need to know whether this man is the child's biological father
Paternity DNA Test
I need to know whether this woman is the child's biological mother
Maternity DNA Test
We may share both the same mother and father
Full Sibling DNA Test
We may share only one parent
Half-Sibling DNA Test
The father cannot test, but his biological parents can
Grandparent DNA Test
The father cannot test, but his biological brother or sister can
Aunt / Uncle / Avuncular DNA Test
The key person cannot test, but several other relatives are available
Family Reconstruction / Complex Kinship
The baby has not been born and paternity needs to be established
Prenatal Paternity DNA Test
Immigration officials, a consulate or another government authority requested DNA
Immigration DNA Testing
The report may be used by a court, lawyer or formal legal process
Legal DNA Testing
There is no standard cheek swab, only a special sample or personal item
Non-Standard Sample Review
I only want to learn where my ancestors came from
Ancestry DNA Testing
I want information about health, nutrition, weight or inherited traits
Health & Wellness / Genetic Testing
Important: do not collect samples yourself.
Confirm the official testing and collection requirements first so identity checks and witnessed collection are arranged correctly.
Family questions
Choose the question that sounds like yours
Each guide below explains the everyday situation first, then the test name and practical limits.
Your situation
You want to know whether a particular man is a child's biological father.
Consider: Paternity DNA test
- Why this may fit
- Paternity means biological fatherhood. When the question is whether a man is a child's biological father and that man can participate, direct Parent–Child Testing is usually considered first.
- Who usually takes part
- The child and the possible father. The mother is usually optional, but can sometimes strengthen the analysis.
- When not to choose it
- Do not choose a sibling or grandparent test when the possible father is available. Do not use a personal home collection if the report may be needed officially.
Your situation
You want to know whether a particular woman is a child's biological mother.
Consider: Maternity DNA test
- Why this may fit
- Maternity means biological motherhood. This direct comparison may be useful in adoption, surrogacy, record concerns or immigration cases.
- Who usually takes part
- The child and the possible mother.
- When not to choose it
- Do not choose ancestry testing; it cannot prove that one specific woman is the child's mother.
Your situation
Two people want to know whether they share both biological parents.
Consider: Full sibling DNA test
- Why this may fit
- A Full Sibling DNA Test evaluates whether two people are consistent with sharing both biological parents. It is especially useful when the shared parent or parents are unavailable for direct testing. If a relevant parent or other known relative is available, tell KINORA before testing because additional appropriate family members may provide more genetic information for the analysis.
- Who usually takes part
- Both possible siblings. An available parent or additional sibling can make the comparison more informative.
- When not to choose it
- Do not choose this if you believe only one parent is shared. If a possible parent can test directly, test that parent instead.
Your situation
Two people want to know whether they share one biological parent, but not both.
Consider: Half-sibling DNA test
- Why this may fit
- Half-siblings share either one mother or one father. Because this is an indirect comparison, the result is a statistical likelihood and can sometimes be inconclusive.
- Who usually takes part
- Both possible half-siblings. Include the shared parent or other close relatives when available.
- When not to choose it
- Do not use it when the possible shared parent can test directly. Do not select full sibling testing if the question is about only one shared parent.
Your situation
A child's possible father cannot test, but his mother, father or both can.
Consider: Grandparent DNA test
- Why this may fit
- The child's DNA is compared with the possible father's parents. Testing both grandparents is normally more informative than testing only one.
- Who usually takes part
- The child and one or, preferably, both possible paternal grandparents. The child's mother may also be helpful.
- When not to choose it
- Do not choose this when the possible father is available. One grandparent alone may not provide a strong enough result in every case.
Your situation
The child's possible father cannot test, but that man's full brother or full sister can.
Consider: Aunt / uncle (avuncular) DNA test
- Why this may fit
- Avuncular simply means aunt-or-uncle testing. The laboratory compares the child with the possible father's sibling to assess whether they are biologically related as niece or nephew and aunt or uncle.
- Who usually takes part
- The child and the possible father's full sibling. The child's mother or more relatives may improve the case.
- When not to choose it
- Do not choose this if the relative is only a family friend or is not the possible father's biological sibling. A direct paternity test is better when the father is available.
Your situation
The key person is unavailable, but grandparents, aunts, uncles, siblings or several generations can participate.
Consider: Family reconstruction / complex kinship
- Why this may fit
- Kinship means a biological family relationship. Family reconstruction combines several relatives to examine a relationship that one standard two-person test cannot answer well.
- Who usually takes part
- As many close, biologically relevant relatives as practical. The useful combination depends on the family tree and the exact question.
- When not to choose it
- Do not order separate tests before the family relationships have been reviewed; the wrong group of participants may add little useful evidence.
A simple sibling example
The Simplest Difference Between Full and Half Siblings
Same mother and same father
→ Full Sibling
Same father, different mothers
→ Half-Sibling
Same mother, different fathers
→ Half-Sibling
Choosing the useful relatives
Grandparents or an Aunt/Uncle — Which Is Better?
The father's biological parents can participate
→ Consider a Grandparent DNA Test.
The father's biological sibling can participate
→ Consider an Aunt / Uncle (Avuncular) DNA Test.
Several grandparents, aunts, uncles or siblings can participate
→ Do not choose one test at random. A Complex Kinship / Family Reconstruction Review may be more appropriate.
The choice is not based on which relative is most convenient. It is based on which available relatives can provide the most useful genetic information for the relationship being assessed.
Before birth, legal or immigration
Sometimes the process matters as much as the relationship
The baby has not been born
Prenatal paternity DNA test
This test examines whether a man is the biological father during pregnancy. It uses a blood sample from the pregnant mother and a sample from the possible father. Eligibility depends on the pregnancy, so the case must be reviewed before booking.
Do not choose an invasive collection method or book before eligibility is confirmed.
See prenatal paternity testing →A court, lawyer or official record may use the report
Legal DNA testing
Legal testing adds verified identity, witnessed sample collection and a documented chain of custody—the written record showing who collected, sealed, handled and delivered each sample.
Samples already self-collected for personal use usually cannot later be supplemented with the formal chain-of-custody record required for legal or immigration use. If formal use is needed later, collection and testing usually need to be arranged again under the applicable requirements.
See legal DNA testing →Immigration officials or a consulate requested DNA
Immigration DNA testing
The authority decides which relationship must be proved. Identity checks, professional witnessed collection and coordinated handling may be required for participants in different countries.
Do not collect or mail samples until the official request and collection instructions have been reviewed.
See immigration DNA testing →When a cheek swab is unavailable
Non-Standard Sample Review
Alternative items may sometimes be reviewed when a normal cheek swab cannot be collected. Before sending anything, tell KINORA what the sample or item is, who it is believed to belong to, how it was obtained, how it has been stored, whether anyone else may have touched it, and which relationship you ultimately want to establish.
Different questions
Ancestry and Health Testing Are Not Relationship Tests
Ancestry DNA testing
Use this when you want information about population origins or deeper family lines. It does not prove that one specific person is your biological father or mother.
See ancestry testing →Health & wellness / genetic testing
Use this when your question concerns health, nutrition, weight or inherited traits. It is separate from testing a specific biological relationship.
See health and wellness testing →Helpful only in specific cases
What Y-DNA and mtDNA can—and cannot—tell you
These are lineage tools, not replacements for a direct parentage test.
Y-DNA: the direct male line
Y-DNA means DNA carried on the Y chromosome and passed from father to son. It can show whether two men may share the same direct paternal line, but it cannot tell whether they are brothers, uncle and nephew, or more distant relatives.
mtDNA: the direct maternal line
mtDNA means mitochondrial DNA, passed by a mother to all her children. It can support a shared direct maternal line, but it cannot identify the exact family relationship on its own.
Purpose and process
Personal, Legal or Immigration — What's the Difference?
Start with the biological relationship, then decide how the result will be used.
Example: you want to know whether a man is a child's biological father.
First identify the relationship: Paternity DNA Test. Then ask how the report will be used:
- Only you and your family want to know → Personal / Peace-of-Mind Paternity Test
- A court, lawyer or formal legal process will receive it → Legal Paternity Test
- IRCC, USCIS, a consulate or another immigration authority requested it → Immigration Paternity Testing
Personal knowledge
For your own information. Collection is simpler, but the report is not intended for court, immigration or another official purpose.
Legal use
For a court, lawyer, estate or official record. Identity must be checked and samples professionally witnessed from the beginning.
Immigration use
Follows the requesting authority's instructions, including the relationship, participants, collection locations and report handling.
KINORA GENETICS (DNA) coordinates cases and professional sample collection. Laboratory analysis is performed by qualified, accredited laboratory partners. Turnaround times are laboratory estimates, DNA recovery from non-standard samples cannot be guaranteed, and acceptance of a report remains the decision of the receiving court, authority or organization.
Avoid preventable delays
Common DNA Test Selection Mistakes
Mistake 1: buying a Grandparent Test when the alleged father can participate
Correct direction: Usually begin with a direct Paternity DNA Test.
Mistake 2: choosing Full Sibling when the people may share only one parent
Correct direction: Consider a Half-Sibling DNA Test.
Mistake 3: an immigration authority requests DNA, but samples are collected at home first
Correct direction: Confirm the official Immigration DNA procedure before collecting samples.
Mistake 4: starting with Personal DNA when the report is intended for court
Correct direction: Follow the Legal DNA process from the first collection.
Mistake 5: assuming testing is impossible because the father has died
Correct direction: The family structure may allow a Grandparent, Aunt/Uncle or Family Reconstruction assessment.
Mistake 6: using Ancestry DNA to prove whether a specific person is your father
Correct direction: To establish a specific parent-child relationship, consider Paternity / Relationship DNA Testing.
Next step
Still Not Sure Which Test You Need?
You do not need to become a DNA expert. When you contact KINORA, tell us only four things:
- 1. Which relationship do you want to establish?
- 2. Who is available for testing?
- 3. What will the result be used for?
- 4. Where is each participant located?
“The child's father has died, but the grandfather, grandmother and uncle are all in Canada. I want to find out whether the child is biologically related to this family.”
You do not need to decide whether this is a Grandparent, Avuncular or Family Reconstruction case. Tell us the actual situation and KINORA will help identify the appropriate testing direction.