In one case, Navigenics called a donor's risk of prostate cancer above average, while 23andMe and deCODE considered his risk average and Pathway judged it to be

In one case, Navigenics called a donor's risk of prostate cancer above average, while 23andMe and deCODE considered his risk average and Pathway judged it to be below average, the report said. In another instance, a donor had a family history of heart disease, the report said, "yet all four companies predicted that she was at average risk for having a heart attack." Both of these examples are incredibly weak evidence. You need statistics to find the accuracy of these products, not anecdotes. Anyway, your genes are a more accurate gauge of disease risk than family history. When a doctor asks about family history, they would prefer to take a look at your genome. It's easy to have a family history of heart attack while having an average risk yourself. If your ancestors had typical genes, but lived a different lifestyle that caused them to be more prone to heart attack, they'd have heart attacks. Hell, they could just be unlucky.