My view is that DNA tests are too dangerous and that there are too many factors to control. Therefore you should never do them.*
I sense a market opportunity for a middleman.
You pay middleman (via Bitcoin, ofc).
You create keypair.
You send bio sample to middleman, along with public key.
Middleman sends your sample to testing facility with no identifying info.
Testing facility sequences your DNA, sends data to middleman.
Middleman encrypts your test result data, makes it publicly available.
You watch for data (rest results) associated with public key, retrieve data, decrypt, use as you see fit.
Results private, as they not traceable to you.