That type of DNA testing is not that expensive or complex any more, I'm not positive but there may be a home test kit on the market.
It's like Bypass surgery, at one time if you got a bypass you went to some BIG name University medical center and got your name in the paper, Same with joint replacement, nowadays they may be major surgery but Dr's crank them out like car repairs because the technology has been more perfected.
It may be a big deal to the patient, but to the doctor it's, "Just another day at the shop ".