who wants to do genetic testing first talk to a genetic counselor. Counselors have specialized graduate degrees and extensive knowledge of the human genome. They 're also trained in explaining test results to laymen. Our message is to be a smart consumer, Nagy says. Know what you 're doing so that when you get the results back you can really use them to your best benefit. Hartmann did some intense investigating, saying he looked at the raw data 23andMe provided him. He eventually found he did indeed have two mutations, he says, but they were n't on the same gene. He says he submitted his bug report to the company and it apologized. In general, Hartmann thinks it's a good thing for every person to have affordable access to his or her genetic data. But he's browsed the community forums on 23andMe. com and has seen how seriously some people take their results -- without fully understanding them. Hartmann says he now believes he will not get limb-girdle muscular dystrophy, although he says there is a risk he could pass the genetic mutations onto his kids. I can live with that, he wrote. For quite some time, I hope. Parents push for standardized screening of Jewish genetic diseases CNN's Dorrine Mendoza and CNNMoney's James O'Toole and Aaron Smith contributed to this report.