What To Do After a Genetic Test Result: Legal & Family Considerations

Why a Genetic Result Can Trigger Legal Planning

Most estate planning documents — wills, healthcare powers of attorney, advance directives — are written at a single point in time, based on the health picture known then. A new genetic result can change that picture substantially. Someone who tests positive for a BRCA1/BRCA2 variant, learns they carry the Huntington's disease expansion, or receives a diagnosis of a progressive condition like familial hypercholesterolaemia or a hereditary cardiomyopathy often has good reason to revisit documents that assumed a different future.

This is not about panic or over-reacting to a single data point — a genetic result is a risk estimate, not a certainty, and its implications vary enormously by condition (see our Huntington's disease, breast cancer, and Alzheimer's disease pages for condition-specific heritability). It is about making sure your legal documents reflect what you now know, on your own timeline and with proper advice.

Updating Your Will and Beneficiaries

A will or beneficiary designation written years ago may no longer reflect your current wishes once a hereditary condition changes your family's outlook. Common reasons people revisit a will after a genetic result include:

• Providing for dependents differently if a diagnosis changes life expectancy or future earning capacity.
• Setting up a trust for a minor child who has also tested positive for a hereditary condition, so funds are managed on their behalf until adulthood.
• Naming a different executor or guardian if the person originally named is affected by the same hereditary condition and may not be well placed to serve in that role later.
• Reviewing life insurance beneficiaries alongside the will, since insurance and will documents are separate and both need updating.

None of this requires disclosing your genetic result to your will provider or attorney beyond what's needed to draft the document — but it does mean the document itself should be current.

Power of Attorney and Advance Directives for Degenerative Conditions

For genetic conditions with a degenerative or progressive course — Huntington's disease, some hereditary forms of early-onset Alzheimer's, ALS-linked genetic variants, and certain metabolic or neuromuscular disorders — a healthcare power of attorney and a living will (advance directive) matter more, and sooner, than for the general population. These documents let you specify, while you have full capacity, who should make medical decisions on your behalf if you later cannot, and what treatments you would or would not want.

Genetic counsellors and neurologists managing degenerative hereditary conditions frequently recommend addressing this early — not because decline is guaranteed on any particular timeline, but because these documents are only valid if signed while you have decision-making capacity. Waiting until symptoms appear can be too late.

A medical power of attorney is a separate document from a general (financial) power of attorney — you may want both, or just one, depending on your situation. This is a good conversation to have with both a genetic counsellor and a solicitor or estate attorney.

Sharing Results With Family: HIPAA and Practical Considerations

Hereditary conditions are, by definition, relevant to blood relatives — a genetic risk found in you is often shared, partially, by siblings, parents, and children. Many people want to share a result with family members so they can consider testing or screening themselves, but doing so through a healthcare provider (for example, forwarding a clinical report or discussing results with a relative's doctor) can run into US privacy law.

In the United States, HIPAA (the Health Insurance Portability and Accountability Act) generally prevents a healthcare provider from sharing your genetic test results with anyone — including family members — without your written authorisation. A signed HIPAA authorisation form lets you name specific people (or a specific provider) who can receive your genetic and medical records, which is useful if you want a sibling's doctor to have direct access to your results as part of their own risk assessment, rather than relying on you to relay details second-hand.

Separately, in the US, the Genetic Information Nondiscrimination Act (GINA) prohibits health insurers and most employers from using genetic test results to discriminate against you — though GINA does not cover life, disability, or long-term care insurance, which is worth knowing before you apply for those policies after testing.

Who Should You Tell — And How?

There's no single right answer, but genetic counsellors generally recommend prioritising first-degree relatives (parents, siblings, children) for conditions with a clear inheritance pattern, since they carry the highest shared risk. For autosomal dominant conditions in particular — where each child of an affected parent has roughly a 50% chance of inheriting the variant — timely disclosure can materially change a relative's own screening or testing decisions.

Many genetic counselling services provide a "family letter" template summarising the result in medically accurate but non-alarming language, which you can share directly or through the relevant family member's own doctor. This is often easier than an unstructured conversation and reduces the chance of details being lost or misunderstood.

Frequently Asked Questions

Do I legally have to update my will after a genetic test result?

No — there is no legal requirement to update your will after a genetic diagnosis. However, many people choose to review beneficiaries, guardianship provisions, and trust arrangements once a hereditary condition changes their family's circumstances, particularly if dependents are also at risk.

What is the difference between a healthcare power of attorney and a living will?

A healthcare power of attorney names a specific person to make medical decisions on your behalf if you cannot. A living will (advance directive) states your own wishes about specific treatments in advance. Many people execute both, especially for degenerative hereditary conditions.

Can my employer or health insurer see my genetic test results?

In the United States, the Genetic Information Nondiscrimination Act (GINA) prohibits most employers and health insurers from requesting or using genetic test results to make employment or health coverage decisions. GINA does not extend to life, disability, or long-term care insurance.

How do I legally share my genetic results with a family member's doctor?

A signed HIPAA authorisation form lets you name specific individuals or healthcare providers who may receive your genetic and medical records, so a relative's doctor can access your results directly as part of their own risk assessment.

Related Genetic Conditions

• Is Huntington's Disease genetic?
• Is Breast Cancer genetic?
• Is Alzheimer's Disease genetic?
• Is Familial Hypercholesterolaemia genetic?
• Is Cystic Fibrosis genetic?