really only testing for the tip of the iceberg. That's where it gets a little scary, because if a person has a normal test result on 23andMe, they leave thinking they do n't have a risk, she says. It's not that the science behind -LRB- this kind of genetic testing -RRB- is n't good. It's that the science behind them is n't complete. The upside of these at-home genetic testing kits -- and 23andMe is n't the only company that sells them -- is that they 've generated a lot of buzz about genetics, Nagy says. She says she believes most early adopters of the tests are information-savvy and understand the results are n't set in stone. I do n't think that anyone thinks that this kit replaces formal testing by a doctor, Heather Armstrong posted on 23andMe's Facebook page. I seriously doubt that a doctor would agree to perform, say, a double mastectomy, based on these results. Joseph Stolarski posted, If you find something interesting, you then take it to a medical professional for further evaluation. No one is or should rely on it for medical diagnosis.It's just a tool, like personally checking your heart rate with a watch or checking your weight on a scale. But Nagy says she worries about what will happen when the tests become more mainstream. Giving this kind of information to someone unfamiliar with genetic testing's limitations could prove dangerous. Nagy recommends anyone