One of the more interesting public radio shows talked about a home genetic testing service called 23andme a number of years ago, maybe as many as five. After sending them your sample, originally, 23andme would send you back their findings on your ancestry and additionally would tell you of genetic markers for various traits, including health liabilities. Then the U.S. Food and Drug Administration told them to hold off on the second part, which to me seemed a violation of one's right to know.

Now I think they were right

From what I can see these 'services' now advertised heavily on television and mainly between two companies, 23andme and Ancestry, give an impression of hard and detailed knowledge, and I think it is overestimated. It is also not clear who owns the information from your body, and your right to keep it private.