What is the term for testing that identifies risk without guaranteeing disease development?

• A. Genetic counseling
• B. Predisposition testing
• C. Diagnostic testing
• D. Carrier testing

Answer: (B)

The term "predisposition testing" refers to genetic tests that identify an individual's risk or susceptibility to developing certain diseases, without providing a definitive diagnosis. This type of testing is particularly valuable for conditions with a genetic component, where knowing one's risk can influence decisions regarding monitoring, prevention, and lifestyle modifications. For instance, a woman with a family history of breast cancer may undergo predisposition testing for BRCA1 and BRCA2 mutations. While a positive result indicates an increased risk of developing breast or ovarian cancer, it does not mean that the individual will definitely develop the disease, as many factors, including environmental and lifestyle influences, also contribute to disease manifestation. This contrasts with diagnostic testing, which aims to confirm or rule out the presence of a specific disease, providing a clear yes or no answer regarding disease status. Carrier testing focuses on identifying individuals who carry one copy of a gene mutation that, when present in two copies, leads to a genetic disorder, rather than assessing risk without confirming disease status. Genetic counseling relates to the process of discussing the implications of genetic testing results, rather than the testing itself.