D4 Medical With a Heart Condition: When You Need an Exercise Test or an Echocardiogram

Most D4 medicals are straightforward: a doctor checks your eyesight, blood pressure and general health, goes through the form with you, and signs it. If you have a heart condition, though, the form is often only the start. The DVLA, or your council if you drive a taxi, may ask for a treadmill exercise test, an echocardiogram, or both, before it will issue or renew your licence. This guide explains which heart conditions lead to which test, what each test has to show, and how to get them done without months of waiting.

Who needs a D4 medical

The D4 is the medical examination report for Group 2 licences, the categories for lorries and buses (C, C1, D and D1, and the trailer versions). You need one when you first apply, again at 45, then every five years until 65 and every year after that.

Taxi and private hire drivers are licensed by their local council rather than the DVLA, but most councils ask for the same D4 form and apply the same Group 2 standard. That is what the Department for Transport's best practice guidance tells councils to do. So the heart rules below apply to most taxi and private hire drivers as well as to lorry and bus drivers. A few councils, Birmingham City Council among them, arrange their own taxi medicals, so check what your council asks for before you book.

The rules for an ordinary car licence (Group 1) are much lighter. Most car drivers with a heart condition never need an exercise test for the DVLA, which is why so many drivers are caught out the first time a Group 2 or taxi medical asks for one.

What the doctor checks about your heart

The D4 asks about your heart history, and the examining doctor records your blood pressure and heart rhythm. For Group 2, you must not drive if your resting blood pressure is consistently 180 or higher systolic, or 100 or higher diastolic, until it is controlled. If you have had a heart attack, a stent, bypass surgery, angina, heart failure, an irregular heartbeat, valve disease or an aortic aneurysm, you must declare it, and the DVLA will usually ask for further evidence. The two tests it asks for most often are an exercise test and an echocardiogram.

When the DVLA asks for an exercise test

The DVLA's guidance for doctors, Assessing fitness to drive (last updated November 2025), asks Group 2 drivers to meet its exercise test standard in these situations:

• After a heart attack or acute coronary syndrome, or after a stent: no driving for at least 6 weeks, then the exercise test and an ejection fraction of at least 40%.
• After bypass surgery (CABG): at least 3 months off, with the exercise test done at least 3 months after the operation.
• Angina: no angina for at least 6 weeks, then the exercise test.
• Established coronary heart disease: a repeat exercise or other functional test at least every 3 years while you hold the licence.
• Peripheral arterial disease, a narrowed carotid artery (more than 50%), or an aneurysm of the abdominal aorta or the descending part of the chest aorta, because these often go with hidden coronary disease.
• Severe aortic stenosis without symptoms, where a yearly licence may be issued if the exercise test is passed.
• Hypertrophic cardiomyopathy in the low or intermediate risk group, where you must complete the full 9 minutes.
• An ECG that suggests a past heart attack, even if you have never had symptoms.

The standard test is a treadmill test using the Bruce protocol. You need to complete 3 stages, which is 9 minutes, without chest pain, fainting, a fall in blood pressure of 20 mmHg or more, a rhythm problem that needs treatment or stops the test, or ECG changes that a cardiologist reads as reduced blood supply to the heart. You do not need to stop your heart tablets beforehand: the current guidance says anti-anginal medication does not have to be discontinued. Our full guide to the DVLA exercise test covers the stages, the pass criteria and how to prepare.

When the DVLA asks for an echocardiogram

An echocardiogram is an ultrasound scan of the heart. For licensing, its main job is to measure your ejection fraction: the share of the blood in the main pumping chamber (the left ventricle) that is pushed out with each beat. A healthy heart pumps out about 50% or more. The DVLA will not issue a Group 2 licence if your ejection fraction is below 40%, whatever the cause, and it names echocardiography or cardiac MRI as the preferred ways to measure it.

You are likely to be asked for an echo, or for the result of a recent one, if you have:

• Had a heart attack, a stent or bypass surgery. The ejection fraction must be at least 40% alongside the exercise test.
• Heart failure or a cardiomyopathy, including dilated and ischaemic cardiomyopathy. Even with no symptoms at all, Group 2 driving depends on an ejection fraction of at least 40%.
• Atrial fibrillation or another arrhythmia. Relicensing needs the cause identified and treated, no rhythm problem likely to cause incapacity for 3 months, and an ejection fraction of at least 40%. If atrial fibrillation first appears during an exercise test, the DVLA also asks for an echo to confirm the pumping function.
• Heart valve disease or valve surgery. After valve surgery or a TAVI, the DVLA needs no significant pumping weakness, again an ejection fraction of at least 40%. With aortic stenosis, the echo is how severity is measured, and severe stenosis changes the rules.
• A cardiac resynchronisation (CRT) pacemaker or a heart transplant.
• A bicuspid aortic valve or a widened aorta. Group 2 limits depend on the diameter of the aorta. With a bicuspid valve you must tell the DVLA once the ascending aorta reaches 4.0 cm, and must not drive from 5.5 cm (5.0 cm with a risk factor such as high blood pressure or a family history of dissection). For other aortic aneurysms the Group 2 limit is 5.5 cm. An echo often gives the measurement, sometimes alongside a CT or MRI scan.

If your ejection fraction was measured during a hospital admission, ask whether that result is recent enough. Pumping function often improves in the months after a heart attack or once heart failure treatment is working, so a fresh echo can show a better figure than the one taken while you were unwell.

A quick guide: which test for which condition

A simplified summary of the DVLA's Group 2 standards. Your own case may differ, and the DVLA, or your council, makes the decision.

When a stress echocardiogram is needed instead

An ordinary exercise test relies on the ECG. When the heart muscle is short of blood during effort, the ST segment of the ECG shifts, and that shift is what the cardiologist looks for. In some people the ECG is already abnormal at rest in a way that hides or mimics that shift, so the treadmill ECG cannot give a reliable answer. For them the DVLA accepts, and in some cases requires, a stress imaging test instead, and a stress echocardiogram is the one most often used.

The DVLA names four situations. Left bundle branch block has its own rule and needs a stress imaging test in its own right. The other three matter when you need a functional test for another reason, such as coronary disease or an aneurysm, and they decide which test is used.

• Left bundle branch block (LBBB). The electrical signal reaches the left side of the heart late, which distorts the ST segments at rest and on exercise. A treadmill ECG cannot be read for reduced blood supply. LBBB has its own Group 2 rule: you may drive but must tell the DVLA, and you are relicensed once a stress echo or a myocardial perfusion scan meets the DVLA standard. This applies even if you have never had a heart symptom, because LBBB can be the first sign of coronary disease or a weakening heart muscle.
• Right bundle branch block with a wide QRS (more than 120 milliseconds). A narrow right bundle branch block is common and usually harmless, but a wide one interferes with the ECG enough that imaging gives the more trustworthy answer.
• A paced rhythm. If a pacemaker is setting your heartbeat, the ECG shows the pacing pattern rather than your heart's own electrical activity, and ST changes cannot be judged. A pacemaker on its own needs only 6 weeks off Group 2 driving and no stress test, but if you also need a functional test, it will be a stress imaging test rather than a treadmill ECG.
• A disability that stops you exercising. If arthritis, a joint replacement, a back problem or another condition means you cannot complete the treadmill stages, the DVLA may first ask the supervising doctor for a report and then accept a stress imaging test.

In a treadmill stress echocardiogram, the heart is scanned at rest, you walk the same Bruce protocol treadmill test, and the heart is scanned again within a minute or two of stopping. Every wall of the heart should move more strongly after exercise. A segment that lags behind is a sign of reduced blood supply to that area. Because the answer comes from the pictures rather than the ECG, LBBB or a pacemaker no longer gets in the way. The DVLA standard is that no more than one segment of the heart muscle shows this change. The rest pictures also give your ejection fraction, so the same visit can answer both of the DVLA's questions.

If you cannot walk on a treadmill at all, the alternatives are a stress echo in which a drug (usually dobutamine) makes the heart work instead of exercise, a myocardial perfusion scan (where the standard is no more than 10% of the heart muscle affected), or a stress cardiac MRI. These are done in hospital cardiology departments; a cardiologist can advise which suits you.

What happens after the tests

You receive a written report from the consultant cardiologist. For the exercise test, it addresses each DVLA criterion in turn and comes with the ECG tracings, by email the same working day. The echocardiogram report states your ejection fraction and describes the valves, chambers and aorta. You, your GP or your D4 doctor send these to the DVLA or your council. The licensing body makes the decision, not the clinic. A Group 2 licence issued after heart assessment is usually short-term, for up to 3 years, and renewal needs fresh medical reports.

If a result does not meet the standard, the report explains why and what comes next: a change of treatment, a further test, or a repeat once you have recovered further. It is far better to find that out in a clinic than at the wheel.

Why drivers come to us

NHS heart tests are rightly prioritised for people with new symptoms, so a licensing test can wait for months while you cannot work. At OneMedicine, in Kings Heath, Birmingham, the treadmill test is £250, the echocardiogram £225, the two together at one visit £450, and a treadmill stress echocardiogram £375. Appointments are usually available within days, you do not need a referral, and every test is supervised or reviewed and reported by a consultant cardiologist. We are a CQC-registered clinic opposite Kings Heath railway station, with free on-site parking. If you also need the D4 itself, see our HGV and bus D4 medicals or taxi driver medicals, and the DVLA heart tests page for every option side by side.

When to see a doctor first

If you have chest pain at rest or on light effort, new breathlessness, palpitations with dizziness, or a recent hospital admission for your heart, see your GP or cardiologist before booking a licensing test. A treadmill test is the wrong test for someone who is currently unwell. If you have severe chest pain, sudden breathlessness or collapse, call 999.

Written by Dr Ibrar Ahmed — MBChB MRCP MRCGP PhD PG Dip (Cardiology)
Specialist interest: Cardiovascular Medicine · OneMedicine, CQC-registered clinic