Not sure if this is why, but I know some folks who are concerned about getting such tests done at the doctor's office due to both cost, and the fact that it will go into their medical records (and thus possibly impact insurance).

Yes it is, and I did this test again on its own after seeing the hematologist. But 23andme offers much more, and when I saw that they offered 50% off on DNA day I impulsively bought it.