The DNA from blood cells is exactly the same as the DNA from buccal cells. Both will provide exactly the same results. Buccal cell collection is the method of choice for genetic testing because it is safe and painless.
If I have already taken an ancestry test and wish to order an upgrade, is a new kit required or can you use the DNA from my original kit?
A recollection may not be required for your ancestry upgrade test if you had recently taken an ancestry test. If