Final answer:
Predictive testing for HD provides individuals with information about their risk of developing the disease, while diagnostic testing confirms the diagnosis in individuals with symptoms. Predictive testing can help individuals make informed decisions, but a positive result can cause emotional distress.
Step-by-step explanation:
For Huntington's Disease (HD), there are two types of genetic testing: predictive testing and diagnostic testing. Predictive testing is used in individuals who are at risk of developing the disease but do not currently have symptoms. It can detect the presence of the gene mutation that causes HD before symptoms appear. Diagnostic testing, on the other hand, is used in individuals who have symptoms of HD and aims to confirm the diagnosis.
One advantage of predictive testing is the ability to provide individuals with information about their risk of developing HD. This can help them make informed decisions about their health and future plans. However, a possible disadvantage is the emotional impact of receiving a positive result for the gene mutation, as it can cause psychological distress.