The secretor DNA test is a genetic test for blood group secretor status. A cheek swab is tested for your FUT2 gene. If you have at least one copy of this gene it means you can make the enzyme fucosyltransferase 2. People with this enzyme can secrete their blood group. It is an alternative to the Lewis blood group test.
The secretor DNA test won't find your ABO blood group, but if you are a secretor your blood group will be secreted in all your body secretions as well as being on your red blood cells.