Genetic counseling for Alzheimer’s disease is built around clarifying which of the categories applies to a particular family, since that classification drives everything else, risk estimates, testing decisions, and monitoring recommendations.

• Building an accurate family history. A counselor typically constructs a three-generation family history, looking closely at age of onset, number of affected relatives, and whether any relative has had genetic testing. Because early death, misdiagnosis, or reduced penetrance can hide a hereditary pattern, this step is done carefully rather than taken at face value.
• Risk assessment tailored to the family’s category. Rather than quoting a single generic number, counseling translates the sporadic, familial, or single-gene distinction into a risk estimate that is actually relevant to that individual.
• Discussing the emotional and practical impact of testing. Because a predictive test result cannot be “undone” once known, counseling explores in advance how a person might cope with either outcome, and what support, family, mental health professionals, or patient organizations, might be useful afterward.
• Reproductive and family planning conversations. For carriers of an APP, PSEN1, or PSEN2 change who are considering having children, counseling can review the fifty-in-one-hundred chance of passing on the gene change and the reproductive options available to some families.
• Coordinating with medical care. While there is no treatment that prevents Alzheimer’s disease in a gene carrier who has not yet developed symptoms, a confirmed genetic diagnosis can guide the type and timing of medical monitoring, help identify whether a person might be eligible for research studies or clinical trials aimed at early intervention, and inform decisions about legal and financial planning while a person can still fully participate in them.

Because research into early detection and genetic risk continues to evolve quickly, families are encouraged to revisit these conversations periodically with a genetics professional rather than treating an initial counseling session as the final word.