Any of the recommended genetic genealogy tests, including the $79 Family Finder test, can produce a list of people who share significant amounts of DNA with you. All but the most speculative of those matches must have ancestors in common with you.
Your match list may include a close relative, i.e. a parent, sibling, aunt, uncle, or first cousin. Now that the databases have grown to include a few million people, this is happening more often.
Even if you only see matches to more distant cousins, i.e. second, third, or fourth cousins, you may still be able to identify your birth family. While your biological family tree may still be blank, many of your DNA matches will be genealogists with extensive family trees.
By contacting your matches, exploring their trees, and using various online resources, you may be able to trace a branch of your relative’s tree to the time and place of your birth. While this process can require considerable effort, many adoptees and search angels are happy to share the methods, tools and tips that have already solved countless adoption mysteries. See the DNA Resources page.
Once you find a possible close relative, you can use the Family Finder test to confirm your discovery. Unlike a paternity test that can only confirm a parent-child relationship, Family Finder actually measures how much DNA any two people have in common.
So even if a parent is unavailable or unwilling to test, you can confirm your biological connection by testing a sibling, aunt, uncle, grandparent, first cousin or even a second cousin. The test can even distinguish full siblings (two parents in common) from half siblings (one parent in common).