A genetic counseling visit for dementia risk is a conversation, not a blood draw. It typically runs about an hour, during which a counselor maps your family history, explains what genetic testing can and cannot tell you, and reviews your options before any sample is collected, according to UCSF's patient education guide. The visit exists to help you decide whether testing makes sense for you at all, not to push you toward a lab order. Most of the hour goes to history-taking and education; testing, when it happens, comes later.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- Building the Family History
- Why APOE Testing Usually Isn't Offered
- When Testing for Early-Onset Genes Is Different
- How Results Are Delivered
- What to Ask About Cost Beforehand
- Frequently Asked Questions
Building the Family History
The counselor starts by constructing a pedigree, a structured family tree covering at least three generations. For each relative who had dementia, they record the diagnosed type, the age symptoms began, and the age of diagnosis, per UCSF's provider education guide. This is the most useful preparation step for a patient: pull together what you know about parents, siblings, grandparents, aunts, and uncles before the appointment.
Exact ages and diagnosis types matter more than a general sense that "dementia runs in the family." The pedigree does real analytical work. The counselor uses it to judge whether a single-gene cause is plausible in your family, then explains how that gene would be inherited and walks through your testing options, including the benefits, risks, and limitations of each, all before any sample is drawn, according to the same UCSF patient guide. A family with several relatives diagnosed young, in their 40s or early 50s, points toward a different conversation than one with a single relative diagnosed at 85.
Why APOE Testing Usually Isn't Offered
Many people arrive expecting to be tested for APOE, the gene most associated with Alzheimer's risk. The 2011 joint guideline from the American College of Medical Genetics and Genomics and the National Society of Genetic Counselors recommends against APOE testing in routine clinical care, citing its limited value for predicting any one person's outcome and the risk of psychological distress or genetic discrimination, according to the ACMG/NSGC guideline. The reason is that APOE-ε4 is a risk marker, not a diagnosis.
The Alzheimer's Association describes it as the strongest known genetic predictor of Alzheimer's risk, but stresses it is neither necessary nor sufficient to cause the disease. Average lifetime risk runs about 10-12%, and roughly doubles with an affected first-degree relative, per the Alzheimer's Association's Genetic Testing Statement. Even where APOE testing is performed, the same ACMG/NSGC guideline notes it has low clinical utility for individual prognosis: ε4 status does not reliably predict whether or when a specific carrier will develop dementia. A counselor explains this distinction directly, so a request for "the Alzheimer's gene test" usually becomes a conversation about what a result would, and would not, tell you.
When Testing for Early-Onset Genes Is Different
Testing changes shape when a family history points toward early-onset, autosomal-dominant Alzheimer's, caused by mutations in the APP, PSEN1, or PSEN2 genes. The ACMG/NSGC guideline recommends this testing only through formal genetic counseling, and for people who are cognitively unimpaired but at risk, it calls for a disclosure protocol modeled on Huntington's disease testing: separate pretest and post-test sessions, with a chosen support person present, according to the ACMG/NSGC guideline.
That structure exists because a positive result in this category is close to deterministic, unlike an APOE result. The pretest session covers what a positive or negative result would mean for you and for at-risk relatives, and gives you time to decide, with support, whether you want to proceed before a sample is ever drawn.
How Results Are Delivered
If testing moves forward, you do not receive lab results directly. The ordering clinician or genetic counselor receives them first and schedules a dedicated post-test visit to go over the result, what it means for you and for at-risk relatives, and to provide a written summary, according to UCSF's patient guide.
This two-visit structure is also why the Alzheimer's Association advises that healthy, asymptomatic people should not pursue routine testing until they have been counseled on the potential social and economic consequences of a result, per its Genetic Testing Statement. Those consequences can include how a result affects eligibility for certain insurance products or how family members react to learning it.
What to Ask About Cost Beforehand
Insurance coverage for genetic counseling and testing varies by plan, and Medicare and Medicaid coverage is limited. Counselors typically raise costs during the visit itself, and patients are advised to confirm their benefits with their insurer before the appointment, according to UCSF's patient guide. Before you call your insurer, have ready: Asking these questions ahead of the visit means the counseling session can focus on your family history and your goals, rather than on logistics you could have settled by phone.
- The CPT or procedure codes for genetic counseling and any specific test under discussion
- Whether your plan requires a referral from your primary care physician
- Whether the counseling visit and the lab test are billed separately
- Whether your plan covers predictive testing for a disease you do not yet have symptoms of
Frequently Asked Questions
Will the counselor test me for the Alzheimer's gene during this first visit?
No. The first visit covers your family history and testing options; any sample collection happens after that discussion, per UCSF's guide.
What should I bring to prepare?
Specific details on relatives with dementia: diagnosed type, age symptoms started, and age at diagnosis, going back three generations where possible, per UCSF's provider guide.
Does a positive APOE result mean I will get Alzheimer's?
No. The Alzheimer's Association states APOE-ε4 is neither necessary nor sufficient to cause the disease, and average lifetime risk is about 10-12%, roughly doubling with an affected first-degree relative, per its Genetic Testing Statement.
