Starting DNA Genealogy: From Your First Test to Your First Discovery

THE GENETIC GENEALOGY SERIES · PART SIX

Starting genetic genealogy is easier when you begin with a clear research question. This guide explains how to choose a suitable DNA test, prepare your sample, understand your privacy options, evaluate additional matching databases, and begin researching your first DNA matches. You will also learn why DNA evidence must be interpreted alongside family trees and historical records.

A practical field guide for the modern family historian

You have explored the science of autosomal chromosomes, traced ancient maternal lineages through mitochondrial DNA, investigated direct paternal ancestry through Y-DNA and learned how these different testing methods can work together. Now comes the most rewarding stage: putting that knowledge into practice.

Beginning genetic genealogy involves more than ordering a test and waiting for an ethnicity estimate. It means choosing a testing strategy, collecting a usable sample, understanding the limits of DNA matching and building a research process that connects genetic evidence with historical records.

This guide is the practical conclusion of our Getting Started with DNA Testing for Genealogy series. Whether you are searching for an unknown ancestor, investigating a family surname, tracing Scandinavian roots or simply trying to understand your family’s past, the goal is the same: begin with a clear plan and make every result count.

01 — Choose the Right DNA Test for Your Research

Your first decision should be guided by your research question, not by the most appealing advertisement. Different tests answer different biological questions, and no single company has every relevant relative in its database.

Autosomal DNA: the best general starting point

Autosomal DNA testing examines genetic material inherited from both parents. Because it can identify relatives across multiple branches of your family tree, it is usually the most versatile first test for general genealogical research.

It is particularly useful for identifying cousins, investigating unknown parentage, testing competing family-tree hypotheses and finding connections to descendants of ancestral siblings.

Comparing the major testing platforms

The value of a matching database depends on where your relevant relatives have tested, which varies with your geographic and family-history background. The cards below are therefore not a ranking: they list what to look into for each provider before you buy.

Matching databases, features and policies change. Provider information was last checked on October 10, 2026; confirm current details on each company’s official site before buying.

For a deeper understanding of the underlying science, continue with our guides to autosomal DNA (Part 2), mitochondrial DNA (Part 3) and Y-DNA (Part 4).

02 — Before You Send Your DNA Sample

Most consumer kits use either saliva collected in a tube or cells collected with a cheek swab. The laboratory extracts DNA from the cells in that material. Collection details differ between kits, so always follow the instructions supplied with your specific test rather than a general guide.

03 — Expand Your Matching Opportunities

Each testing company has its own pool of participants. Your closest genetic relative may have tested with a different provider, so a single database cannot reveal every possible connection. Researchers often describe searching several databases as fishing in different ponds.

The principle is sound, but not every service accepts uploads of DNA data from other companies, and the rules change. When you plan a multi-database strategy, keep three questions separate:

• Can you upload? Whether the service accepts new raw-data uploads, and from which providers and file versions.
• Can you see matches? Whether matching is available to you after uploading, or only to customers who tested with that company.
• What costs extra? Which advanced tools or features require payment.

Official rules for the services most often used

• FamilyTreeDNA: accepts certain eligible files, with restrictions on some file versions. Read the current requirements on FamilyTreeDNA’s autosomal transfer page.
• MyHeritage: no longer supports new raw-data uploads, so joining its matching service requires a MyHeritage DNA kit. See the current MyHeritage upload policy.
• GEDmatch: offers third-party comparison tools. Before uploading, review its terms, data retention provisions, deletion options and law-enforcement matching settings at GEDmatch.

Upload rules last checked on October 10, 2026. A transfer is a copy of your genetic data, not a physical transfer of your sample, and each service may process it differently, so verify eligibility and fees before planning your budget.

If your research involves adoption or unknown parentage, explore our specialist guide to DNA testing for adoptees and our collection of free genealogy tools.

04 — Protect Your Genetic Privacy

DNA data is unusually personal. It can reveal information not only about you, but also about biological relatives who may never have taken a test themselves. Privacy decisions should be part of your research plan from the beginning, not an afterthought once your results appear.

Five settings and decisions worth reviewing

• Display name: Check whether the platform permits initials or a research alias. A pseudonym can reduce casual visibility, but it does not guarantee anonymity.
• DNA matching: Understand which information other participants can see and whether you can opt out of matching without deleting your entire account.
• Ethnicity estimates and family trees: Review the visibility settings for your reports, linked trees, surnames and other profile details.
• Research and law-enforcement policies: Read the current rules for investigative genetic genealogy, including any opt-in or opt-out choices. Do not assume that the same setting applies across all companies.
• Retention and deletion: Find out how to delete a test, remove uploaded data, request destruction of a stored biological sample where applicable, and revoke permissions granted to third parties.

Understand investigative genetic genealogy

Some genetic genealogy services have policies that permit certain law-enforcement searches, subject to their specific eligibility rules and legal requirements. Other services have different restrictions. These policies can change, and the rules may distinguish between cases involving violent crimes, unidentified human remains and other investigations.

Before enabling or disabling a setting, read the current policy for the specific service. For reference, consult the FamilyTreeDNA Law Enforcement Guide and the relevant privacy and matching policies published by GEDmatch.

Finally, remember that a genetic match may expose unexpected family relationships. Consider the possible implications for biological relatives before sharing match screenshots, family trees or identifying details publicly.

05 — Build Your First DNA Match-Analysis Workflow

When your results arrive, the number of matches can be overwhelming. The temptation is to begin clicking through every profile or to treat an ethnicity estimate as the answer to your family-history question. A more effective approach is to work systematically from the strongest evidence toward more distant possibilities.

Start with your closest matches

Begin with matches sharing substantial amounts of DNA, particularly those with usable family trees or known relationships. Record the amount of shared DNA in centimorgans (cM), the number of shared segments where available, any predicted relationship, and the evidence supporting your interpretation.

Do not treat a predicted relationship as definitive. Several relationships can share overlapping centimorgan ranges, and the same amount of shared DNA can fit different family structures. Use the Shared cM Project as a reference for possible relationships.

Use clustering to reveal family branches

When you have enough suitable matches, grouping them can reveal clusters that may represent different branches of your family. The Leeds Method is one established approach for organizing matches into groups.

These groups do not automatically correspond to four grandparents. The outcome depends on the relatives available, their relationships to one another, endogamy, pedigree collapse and the amount of DNA shared. Treat clusters as working hypotheses that require further evidence.

Compare trees and verify the evidence

1. Build a small research log. Record the match identifier, shared cM, potential relationship, tree link, relevant surnames and the source of each conclusion.
2. Look for shared ancestral couples. Compare documented parents, grandparents, locations and dates across several match trees rather than relying on one surname alone.
3. Separate facts from hypotheses. Mark which relationships are supported by original records, which are inferred from DNA and which remain unverified.
4. Investigate the documentary trail. Search civil registration records, census returns, parish registers, probate files, land records and other sources relevant to the region and period.
5. Test competing explanations. Ask whether the proposed relationship explains the DNA evidence and the historical timeline better than alternative hypotheses.

ILLUSTRATIVE EXAMPLE · NOT A REAL CASE

Example: Investigating an Unknown DNA Match

Imagine you are researching your maternal grandmother’s family. A new match, “M.K.”, shares about 230 cM with you across several segments and has a small, unsourced family tree. All names, places and numbers below are invented to show the method.

1. Record the evidence. Note the shared cM, the number of segments, the match’s tree and the source of each detail.
2. Develop possible explanations. Use the shared cM to list several plausible relationships rather than choosing one immediately. An amount like this is in a range commonly reported for second cousins, but it also overlaps with other relationships, such as a first cousin twice removed or a half first cousin once removed.
3. Compare family trees. M.K.’s tree names a great-grandmother, Greta Nilsson, born around 1892 in Dalarna. Your own research shows a great-grandmother Greta Nilsson, born around 1891 in the same region.
4. Check independent evidence. Look for other matches who descend from the same Greta. Then search parish and census records for her birth, marriage and children.
5. State the conclusion cautiously. Record which explanation is best supported, which alternatives remain open and what evidence is still missing.

EVIDENCE	INTERPRETATION	REMAINING UNCERTAINTY
About 230 cM shared with M.K. across several segments	Consistent with a second-cousin-level relationship	The same amount overlaps with other relationships, so cM alone cannot decide
M.K.’s tree lists a Greta Nilsson, b. c. 1892, Dalarna	Could be the same woman as your great-grandmother, b. c. 1891, Dalarna	Common name, a one-year difference in birth year, and an unsourced tree
Two other matches in the same cluster descend from Greta’s family	Supports a link to that branch of your tree	The matches may share a different ancestor further back
Parish records not yet checked	Records could confirm or rule out that both trees describe the same Greta	Records may be incomplete or ambiguous for this parish and period

Cautious conclusion: a second-cousin relationship through Greta Nilsson is currently the best-supported working hypothesis, not a proven fact. Alternatives remain open until the parish records and further matches either support or contradict it.

For additional support, explore our DNA Relationship Calculator, free genealogy templates and global genealogy resources by country. When using family-tree files, check the privacy of the files and the people represented before uploading or sharing them.

06 — Your First DNA Research Session

You do not need to solve your entire family tree in one sitting. Your first session should establish a reliable foundation, preserve your information and identify one manageable research question.

Frequently Asked Questions

What is the most cost-effective way to start DNA genealogy?

For many beginners, one autosomal DNA test is a sensible starting point. Compare the database, current price, regional relevance and research tools before purchasing, and only then look into transfer options for additional databases.

How long do DNA test results take?

Processing times vary by provider, shipping route and laboratory workload. Several weeks is common, but there is no universal turnaround time. Check the current estimate from your testing company.

Should I pay for subscription upgrades immediately?

Not necessarily. Start with the matching tools and records already available to you, and pay for additional features when you have a defined research question and understand how the upgrade could help answer it.

Can I upload my DNA file to every major genealogy database?

No. Upload policies vary and change over time, so check each service’s official rules, as described in section 03.

Can DNA prove that a particular person was my ancestor?

DNA can provide strong evidence for a biological relationship, but identifying a specific ancestor usually requires additional analysis. A well-supported conclusion combines genetic evidence with reliable historical records.

Your First Steps in Genetic Genealogy

Start with one test, one clear research question and a method for recording what you learn. Expand to other databases when it makes sense, protect the privacy of everyone involved, and keep treating every match as a lead to be verified against records. When you are ready, choose your next step:

Want to review the full learning path? Return to Part 1 of the Getting Started with DNA Testing for Genealogy series.

Sources and Further Reading

• Theda C, Hwang SH, Czajko A, Loke YJ, Leong P, Craig JM. Quantitation of the cellular content of saliva and buccal swab samples. Scientific Reports, 2018.
• International Society of Genetic Genealogy. Autosomal DNA testing comparison chart.
• International Society of Genetic Genealogy. Centimorgan.
• International Society of Genetic Genealogy. Autosomal DNA statistics.
• Blaine T. Bettinger. The Shared cM Project.
• Dana Leeds. DNA Color Clustering: The Leeds Method for Easily Visualizing Matches.
• Ancestry. Downloading DNA Data.
• MyHeritage. Current DNA upload policy.
• FamilyTreeDNA. Autosomal DNA transfer options and requirements.
• FamilyTreeDNA. Law Enforcement Guide.
• GEDmatch. Platform information, terms and privacy policies.

Editorial note: Testing availability, transfer eligibility, processing times, pricing and privacy policies can change. Confirm current details directly with the relevant provider before purchasing a test or uploading genetic data.