Long QT in the Family and UK Life Cover

If long QT syndrome was found in your family after a sudden death, and you now have a life insurance application in front of you, the first thing to separate is the gene from the heart trace. Applying for life insurance with long QT syndrome in the family turns on a distinction the form does not spell out: a predictive genetic result is one thing, and the ECG that led to it is another. A UK insurer cannot ask you for the gene result. It can ask about the ECG, and everything that followed from it.

That split is not a technicality. It decides what you have to write on the form and what you can leave off it. The long QT variant itself — the fault identified by cascade testing after the death — is a predictive genetic result, and under the UK rules an insurer may not request it or use it. But an ECG is not a genetic test. The trace, the QT interval it measured, any diagnosis made from it, the beta blockers you may now take and any device fitted are ordinary medical evidence, and those are disclosable if the application asks.

So this is not a case where an inherited arrhythmia quietly shuts you out of cover. It is a case where knowing which facts are protected and which are fair questions lets you answer accurately, keep the protected result off the form, and give a genuine claim nothing to trip over later.

How long QT is usually found: cascade testing after a death

Most people reading this did not go looking for long QT syndrome. It found them, through the worst possible door. A young relative died suddenly and without an obvious cause, a coroner investigated, and where a post-mortem cannot explain the death, attention turns to the living. First-degree relatives — parents, brothers, sisters and children — are referred to a specialist inherited cardiac conditions service for assessment.

That assessment usually begins with an ECG, often alongside an echocardiogram and sometimes an exercise test, and genetic testing may run in parallel. If a long QT variant is identified in the family, relatives can be tested for that specific fault. This is cascade testing: following a known fault outward through a family, one relative at a time. It is why so many people meet long QT not as a diagnosis of illness but as a result on a form, arriving in the middle of grief. The pathway after an unexplained sudden death is one we cover across the wider family history, inherited risk and the odds hub.

The gene result: a predictive result they cannot ask for

The rule that governs this in the UK is the Code on Genetic Testing and Insurance, an agreement between the government and the insurance industry. Its central commitment is that an insurer will not ask you to take a predictive genetic test, and will not require or use the result of one when deciding whether to offer cover or on what terms.

There is a single listed exception, and it is Huntington's disease, only for life cover above £500,000. Long QT syndrome is not on that list, at any level of cover. So a predictive long QT result — a variant found in you through cascade testing while you are well — cannot be asked for, and cannot be used against you, whatever amount of cover you apply for.

Source: HM Government and the Association of British Insurers, Code on Genetic Testing and Insurance.

This is the part that most online advice gets wrong, because a great deal of it is written for other countries with different rules. In the UK the protection is already built in. A predictive genetic result is not the obstacle to cover that people fear, and our piece on why most life policies never reach the genetic testing threshold shows how rarely the genetics rules bite at all.

The ECG and what follows it: ordinary medical evidence

Here is where people trip, because the protection does not stretch as far as they hope. It covers the gene result. It does not cover the heart.

An ECG is a recording of your heart's electrical activity. It is not a genetic test, and it sits expressly outside the Code. So the trace itself, the QT interval measured on it, and any diagnosis a cardiologist made from it are ordinary medical evidence. If your application asks about heart investigations, hospital tests, diagnoses or treatment — and most applications do — those must be answered accurately. The same goes for treatment that followed: beta blockers, advice to avoid certain medicines, and any implanted device such as a defibrillator are all disclosable medical facts.

Think of it as two separate files. One file holds the predictive gene result, and the insurer is not allowed to open it. The other holds your cardiology history — the ECG, the QT measurement, the diagnosis, the medication, the device — and that file is a fair question. You keep the first closed and answer the second honestly. A diagnostic test taken because something was already suspected is treated as medical evidence too, precisely because by then it is describing a condition you have rather than a risk you carry.

What long QT syndrome actually is

It helps to understand the condition, both to answer questions sensibly and to keep the fear in proportion. Long QT syndrome is a disorder of the heart's electrical system — a channelopathy — in which the heart takes longer than normal to reset between beats. That extra delay is the "long QT" measured on the ECG. Most of the time it causes no symptoms at all.

Its danger is that it can, occasionally, trigger an abnormal heart rhythm that causes a blackout and, rarely, a cardiac arrest. Episodes are often provoked by a specific trigger — physical exertion, a sudden fright or loud noise, or certain medicines that prolong the QT interval further. Crucially, it is treatable. Beta blockers are the usual mainstay, alongside avoiding drugs and triggers that lengthen the QT interval, and for some people an implanted device is fitted as a safeguard. You can read a clear clinical description at the NHS and more on inherited heart conditions from the British Heart Foundation. Being identified, monitored and treated is the good outcome here — it is how a hidden risk becomes a managed one.

Answering the application accurately

Underneath the whole subject sits the Consumer Insurance (Disclosure and Representations) Act 2012, which sets out what you owe an insurer. It does not ask you to volunteer everything you can think of. It asks you to take reasonable care not to make a misrepresentation — to answer the questions you are actually asked honestly and carefully.

Applied to long QT, that means three things. Answer the cardiology questions fully: the ECG, the QT interval, the diagnosis, the beta blockers, any device. Do not offer up the predictive gene result, which the insurer is not permitted to ask for. And if the family's specific fault was identified and you tested negative for it, that favourable result is one you are allowed to volunteer if it helps you, though you are never obliged to. Get the medical answers right and there is nothing about an inherited arrhythmia that should unsettle a future claim; get them wrong and a claim can be questioned.

One thing you should not do is delay or skip a clinically important test to keep an application clean. If a cardiac genetics team is offering you cascade testing, the reasons to have it — the chance to be treated before anything happens — almost always outweigh the insurance arithmetic, and the genetic result cannot be asked for anyway. We make that case in full in why you should not skip a test to protect your insurance, and although it is written around a cancer syndrome, the principle is identical for an inherited heart condition.

Getting cover, and what a policy still does for you

People with a treated, monitored inherited arrhythmia do get life cover. What an underwriter looks at is the medical picture — the diagnosis, how it is managed, whether you have had symptoms or events, and how stable things are — not the protected gene result. Outcomes vary between insurers, which is exactly why comparing matters, and why this is worth doing through someone who understands the genetics rules rather than guessing on a comparison site.

You can get life insurance quotes and have an FCA-authorised broker approach it in the right order, so your cardiology history is answered accurately and the gene result stays where the Code puts it — off the form. A broker who knows this area can help you answer the medical questions precisely, without dragging the protected result onto the page.

It is also worth knowing what a policy does once it is in place. Many life policies pay early on a terminal diagnosis, and the timing of a payout depends on how the policy is arranged — a point we cover in why some payouts take days and others take months. For a sense of how a life policy's built-in benefits can matter for a serious inherited condition, our note on motor neurone disease in the family and the benefit inside a life policy is a useful companion, and for how underwriting treats another inherited condition entirely, see life cover with Lynch syndrome.

Scotland and Northern Ireland

The insurance rules are the same across the United Kingdom. The Code on Genetic Testing and Insurance is an industry-wide agreement, so a predictive long QT result cannot be asked for or used in Scotland or Northern Ireland any more than in England and Wales, Huntington's above £500,000 aside. The Consumer Insurance (Disclosure and Representations) Act 2012 applies UK-wide too, so the same "reasonable care" standard governs how you answer the cardiology questions wherever you live.

What can differ is the clinical pathway around you: how inherited cardiac conditions services are organised, referral thresholds, and how a coroner's or procurator fiscal's investigation into a sudden death proceeds. In Scotland, sudden and unexplained deaths are investigated by the procurator fiscal rather than a coroner, and the route into family screening can look different as a result. Those differences affect your medical history and how you came to be tested, not the insurance rule itself, which does not change between the nations.

Frequently asked questions

Can an insurer ask about a long QT gene result?

No. A predictive genetic result cannot be requested for UK life cover under the Code on Genetic Testing and Insurance, whatever the condition, apart from Huntington's disease above £500,000. That includes a long QT variant found through cascade testing after a sudden death in the family. The insurer may not ask for it and may not use it, at any sum assured.

What about the ECG that found it?

An ECG is not a genetic test and sits expressly outside the Code, so the trace, the QT interval measured, any diagnosis made from it, medication such as beta blockers, and any device fitted are ordinary medical evidence. They are disclosable if the application asks about heart investigations, diagnoses or treatment, and you should answer those questions accurately.

Is long QT syndrome dangerous?

It is a heart rhythm disorder that can cause blackouts and, rarely, sudden cardiac arrest, often triggered by exercise, a sudden fright or certain medicines. It is treatable, usually with beta blockers, by avoiding drugs that prolong the QT interval, and sometimes with an implanted device. Being identified and managed turns a hidden risk into one that is monitored and controlled.