If you have been advised to have a heart test, you may be wondering whether you need an ECG, an echocardiogram or both. These tests provide different kinds of information: an ECG records the heart’s electrical activity, while an echocardiogram uses ultrasound to create images of the heart’s structure and movement. To understand what to expect from your appointment, read about how we work.
Dr Chabok offers private cardiology consultations and diagnostic services, including ECG interpretation and echocardiography, at clinics in London and nearby areas. The appropriate test depends on your symptoms, medical history and the clinical question being considered. This guide explains the differences and what you can expect when arranging a private ECG and echocardiogram in London. Because high blood pressure can affect the heart, your doctor may consider it when deciding whether further tests are appropriate.
What is an ECG?
An electrocardiogram, usually shortened to ECG or EKG, records the electrical signals that coordinate your heartbeat. Small sensors called electrodes are placed on your skin, usually on your chest and limbs. They connect to a machine that produces a tracing of the heart’s electrical activity.
A standard resting ECG is quick and non-invasive. You lie still while the recording is taken, and the electrodes are then removed. The test does not send electricity into your body. A clinician interprets the tracing alongside your symptoms and other relevant information.
An ECG can help a clinician assess your heart rhythm and look for electrical patterns that may need further investigation. It is a recording from a particular period of time, however. If symptoms come and go, a short resting ECG may not capture an episode. A clinician may consider other forms of monitoring depending on your circumstances.
What is an echocardiogram?
An echocardiogram, often called an echo, is an ultrasound scan of the heart. It uses sound waves to produce moving images. These can help a clinician assess the heart’s chambers, valves, pumping action and blood flow. Unlike an ECG, an echo focuses on the heart’s structure and how it moves.
For a standard transthoracic echocardiogram, you usually lie on an examination couch, often on your side. A sonographer or clinician applies gel to your chest and moves a handheld probe over the skin to collect images. You may be asked to change position or briefly hold your breath to help obtain particular views. The scan is external and does not use ionising radiation.
The time needed can vary according to the views required and the reason for the scan. The person carrying out the test may not be able to discuss a full interpretation during the examination. A cardiologist considers the findings in context and explains what they mean for your care.
ECG and echocardiogram: the main differences
Although both tests relate to the heart, they answer different questions. An ECG records electrical activity; an echocardiogram creates ultrasound images of the heart in motion. One does not simply replace the other, and a clinician may recommend either test or both.
- ECG: records heart rate and rhythm and other electrical patterns during the recording.
- Echocardiogram: assesses the heart’s structure, valves, pumping movement and blood flow using ultrasound.
- What you experience: an ECG involves skin electrodes and a short recording; an echo involves gel and a probe moved over the chest.
- What they can tell you: each test provides specific information, and neither on its own answers every question about heart health.
Depending on the concern, your assessment may also include a discussion of your symptoms, examination, medical history or other investigations. The choice of test should follow the clinical question, rather than a one-size-fits-all approach.
When might a clinician recommend an ECG?
A clinician may recommend an ECG when assessing symptoms such as palpitations, a racing or irregular heartbeat, chest discomfort, breathlessness or dizziness. An ECG may also form part of an assessment when there is a relevant medical history or a need to review the heart’s electrical activity.
Having one of these symptoms does not necessarily mean there is a heart problem. Equally, a normal result from a brief ECG does not rule out every possible cause of symptoms. Your clinician will interpret the tracing alongside the details of what you have experienced and decide whether any further assessment is appropriate.
When might an echocardiogram be recommended?
An echocardiogram may be recommended when a clinician wants to assess the heart’s structure or function. This could be because of symptoms, examination findings or information from another test. For example, it may help investigate a suspected valve concern or assess how well the heart is pumping.
An echo is not a general screening test that is automatically needed by everyone. Whether it is useful depends on your individual circumstances and the question your clinician is trying to answer. If you have been advised to have one, you can ask what the scan is intended to assess and how its result will be considered with your other information.
Can you have an ECG and an echocardiogram at the same appointment?
It may be possible to arrange both tests as part of a private cardiac assessment, depending on clinical need and appointment arrangements. The tests are complementary, not interchangeable: an ECG examines electrical activity and an echo examines structure and movement. A consultation can help establish which investigation is appropriate and whether one or both are needed.
When contacting the clinic, explain what prompted the assessment and mention any advice or referral you have already received. You can also ask about the available appointment options and whether any preparation is required. Dr Chabok’s private cardiology services include ECG interpretation and echocardiography at clinics in London and nearby areas.
How to prepare for your appointment
Preparation depends on the specific tests arranged. A resting ECG and a standard echocardiogram commonly require little special preparation, but follow the instructions given by the clinic. Do not stop or change prescribed medication unless a clinician has specifically advised you to do so.
- Bring any relevant letters, previous test results or a list of your medicines, if available.
- Be ready to describe your symptoms, including when they occur and how long they last.
- Wear clothing that makes it practical to access the chest area for the tests.
- Contact the clinic beforehand if you have questions about access, timing or preparation.
If you are unsure whether you need an ECG, an echo or a consultation first, ask the clinic to discuss the options with you. The right pathway can depend on the reason for the assessment and your medical history.
Understanding your results
Test findings are interpreted in context. A clinician may consider your symptoms, examination, relevant medical history and the quality of the recording or images. If a result needs follow-up, the cardiologist can explain what it shows and discuss appropriate next steps. A test result should not be treated as a diagnosis without clinical interpretation.
It is also important to understand that no single test can assess every aspect of heart health. If symptoms continue despite a reassuring result, discuss this with a clinician so that the situation can be reviewed and any further assessment considered.
Arranging a private heart assessment in London
A private consultation can provide an opportunity to discuss your concerns and whether diagnostic tests are suitable. Dr Chabok provides private cardiology consultations and services including ECG interpretation and echocardiography in London and nearby areas. To discuss an appointment, contact the clinic and explain whether you have been advised to have a particular test or would first like to speak with a cardiologist.
If you are experiencing severe or persistent chest pain, sudden severe breathlessness, fainting or another possible emergency, seek urgent medical help rather than waiting for a private appointment. In the UK, call 999 for an emergency.
Frequently asked questions
Is an ECG the same as an echocardiogram?
No. An ECG records electrical activity and heart rhythm. An echocardiogram uses ultrasound images to assess the heart’s structure, movement and blood flow. A clinician may recommend one or both depending on the clinical question.
Does an ECG hurt?
A standard resting ECG is painless. Electrodes are attached to the skin to record the heart’s electrical signals. You may feel the adhesive when they are removed, but the test does not send electricity into your body.
Does an echocardiogram use radiation?
A standard echocardiogram uses ultrasound, not ionising radiation. The probe is moved over the chest with gel to obtain images of the heart.
How long does an ECG or echocardiogram take?
A resting ECG is usually a short recording. An echocardiogram takes longer because the operator collects a series of ultrasound views. The time can vary depending on the test and the information required; ask the clinic about the appointment arrangements.
Can I book an echo without an ECG?
The appropriate test depends on your symptoms, history and the reason for assessment. An echocardiogram and an ECG provide different information, so a clinician can help determine whether an echo alone, an ECG, both tests or a consultation first is suitable.
Frequently Asked Questions
Is an ECG the same as an echocardiogram?
No. An ECG records electrical activity and heart rhythm. An echocardiogram uses ultrasound images to assess the heart’s structure, movement and blood flow. A clinician may recommend one or both depending on the clinical question.
Does an ECG hurt?
A standard resting ECG is painless. Electrodes are attached to the skin to record the heart’s electrical signals. The test does not send electricity into your body.
Does an echocardiogram use radiation?
A standard echocardiogram uses ultrasound, not ionising radiation. The probe is moved over the chest with gel to obtain images of the heart.
How long does an ECG or echocardiogram take?
A resting ECG is usually a short recording. An echocardiogram takes longer because the operator collects a series of ultrasound views. The time can vary depending on the test and information required.
Can I book an echo without an ECG?
The appropriate test depends on your symptoms, history and reason for assessment. A clinician can help determine whether an echo alone, an ECG, both tests or a consultation first is suitable.