A DNA Genealogist uses DNA to trace your lineage to create a family tree, and locates “high probability” biological family members by assessing shared DNA between you. Once high probability family members are determined, these are the individuals you will want to have tested.
It is our recommendation that you test with all available known testing centers so as to cast your net as wide as possible. Ancestry, Family Tree DNA, 23andMe, and GEDMatch will likely all yield different results and matches. If finances allow, make sure to test with all of them and watch for updates closely.