What type of testing determines the genetic status of asymptomatic individuals?

What type of testing determines the genetic status of asymptomatic individuals?

• A. Carrier testing
• B. Predictive testing
• C. Diagnostic testing
• D. Screening

Answer: (B)

Predictive testing is designed for asymptomatic individuals to determine their genetic predisposition to a specific disease or condition. This type of testing often assesses the risk of developing certain hereditary conditions based on the presence of specific genetic markers. It is particularly useful for individuals with a family history of genetic disorders who want to understand their risk more clearly.

For example, someone may undergo predictive testing for mutations associated with breast or ovarian cancer, such as the BRCA1 or BRCA2 genes. A positive result in predictive testing indicates a higher likelihood of developing the disease, allowing individuals to make informed decisions regarding monitoring and preventative measures.

The other types of testing, while important in their own contexts, serve different purposes. Carrier testing is typically used to determine if an individual carries a gene for a recessive genetic disorder, usually conducted when there is a possibility of passing the condition to offspring. Diagnostic testing is performed to confirm or rule out a specific genetic disorder in individuals who are already showing symptoms, while screening usually involves a broader population and aims to identify individuals at risk of certain diseases rather than focusing specifically on genetic predisposition. These distinctions clarify why predictive testing is the most appropriate choice for assessing genetic status in asymptomatic individuals.