Indivisuals who are known to be at risk for a disorder can be tested (generally bcz of a (+)ve family history.
To determine whether they have inherited a disease-causing mutation before they develop clinical symptoms of the disorder.
Ex: Huntington Disease, adult polycystic kidney disease, hemochromatosis & autosomal dominant breast cancer.
Can aid in making reproductive decisions.
Can provide reassurance to those who learn that they do @ do not carry a disease-causing mutation.
Early diagnosis may improve health supervision.