Unraveling Your DNA's Secrets
Do-it-yourself genetic tests promise to reveal your risk of coming down with a disease. But do they really deliver?
Predictive. A few tests can help gauge the odds of having a familial version of a disease.
Diagnostic. Genes can reveal or confirm inherited diseases such as sickle cell, as well as rare disorders.
Nutrigenomic or nutrigenetic. Sold as offering customized nutritional advice, but they're questionable.
Pharmacogenetic. Doctors now use genes to tailor cancer treatments to the individual patient. More are in the works.