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Cardiology > 3-Day ECG
A 3-Day ECG (Electrocardiogram) is a diagnostic tool used to monitor and record your heart’s electrical activity over a continuous period of three days.
Unlike a standard ECG that captures a brief snapshot of your heart’s function, the 3-Day ECG provides a detailed, extended view of your heart’s rhythms and functions, making it an invaluable tool for detecting intermittent or less obvious cardiac issues.
Extended monitoring with a 3-Day ECG provides a more thorough evaluation than shorter ECG tests. This in-depth analysis helps our specialists identify irregular heart rhythms, such as atrial fibrillation or ventricular arrhythmias, and assess the effectiveness of treatments or medications.
Designed with patient comfort in mind, the 3-Day ECG features a small and lightweight monitoring device. This allows you to continue with your daily activities while your heart is being monitored.
You should keep the monitor dry and avoid bathing, swimming, or showering while wearing it. At the end of the monitoring period, the cardiologist will review and assess your results. This test is typically recommended if you experience symptoms such as shortness of breath, fainting (syncope or pre-syncope), blackouts, dizziness, or chest pain (angina).
A 3-Day ECG might also be suggested if you are already on heart medication, to evaluate how well it is working and if any adjustments are needed. You can continue with your daily activities as usual while wearing the ECG monitor. We may ask you to note your activities to help us understand how your heart responds to various situations and stresses.
The 3-Day ECG facilitates early detection of potential heart conditions, even if symptoms are sporadic or not present during a standard ECG. By providing comprehensive data, it offers a complete picture of your heart’s performance over time.
It also provides peace of mind by helping to assess heart health and ensuring that any detected issues are managed appropriately.
Understanding your heart’s health is crucial, and our advanced monitoring process provides a detailed snapshot of its electrical activity. Here is how it works:
Use our online booking engine or book your appointment by giving us a call.
On the online booking engine select the “appointment type” you need.
You will be seen by one of our friendly doctors or trained clinicians.

Wear loose, comfortable clothing that can be easily removed or adjusted, as electrodes will be attached to your chest. Do not apply lotions, oils, or powders to your chest area on the day of the appointment, as they can interfere with electrode adhesion. Inform your healthcare provider of any medications you’re taking and any relevant medical history, including heart conditions or allergies. Follow any specific instructions given by your healthcare provider, which might include avoiding certain activities or substances.

Electrodes will be attached to your chest, arms, and legs to monitor your heart’s electrical activity over a 3-day period. You will be given a portable ECG monitor that you can carry with you throughout the day and night. Continue with your usual daily activities, but try to avoid strenuous exercise and heavy lifting if advised by your healthcare provider. Ensure the ECG monitor remains in place and avoid getting it wet. Follow any instructions provided for handling the device.

Return the ECG monitor to the clinic or facility as instructed. Ensure it is returned in the same condition as when you received it. Your healthcare provider will interpret the data and provide recommendations based on the findings. If any electrodes or adhesive residues remain on your skin, gently remove them according to the provided instructions or consult your healthcare provider for guidance.
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All reviews4.8![]()
Trustindex5.0
Provenexpert5.0
Yell5.0Posted on Google![]()
Jooyoung Nam10 September 2026Trustindex verifies that the original source of the review is Google.
I had a very positive experience at this clinic for my blood test and the follow-up with the GP. I particularly appreciated the care and attention throughout the process, including the follow-up after my results. Thank you to the team for making the experience so reassuring. I would happily recommend this clinic.Posted on Google![]()
Lucy Cropper31 August 2026Trustindex verifies that the original source of the review is Google.
I had a fantastic experience at the Harley Street clinic. Staff were very welcoming and professional and booked my second blood test here also.Posted on Google![]()
Truman Packard19 August 2026Trustindex verifies that the original source of the review is Google.
The service was efficient, personable and very complete. The doctor who saw me was very good, patient and sensitive. I’ll be going back.Posted on Google![]()
Sue Heald11 August 2026Trustindex verifies that the original source of the review is Google.
As an international visitor, I was very grateful for the prompt attention to my request for an appointment. Dr Ali was respectful and empathetic in regard to my condition and suggested further treatment, which I was able to organise for the next day. Both offices I attended treated me appropriately and I would recommend Harley Street Health Walk-in Clinics to anyone visiting London who requires medical attention.Posted on Trustindex![]()
Isabella Johnson3 August 2026Trustindex verifies that the original source of the review is Trustindex.
Highly recommend City Walk-In Clinic Really pleased with my experience at City Walk-In Clinic. I booked a female hormone test because I wanted some answers about a few symptoms I'd been having, and the whole process was straightforward. The staff were welcoming, friendly and didn't make me feel rushed at all. The blood test was quick, and they explained everything clearly before taking the sample. My results came back sooner than I expected, and it was reassuring to have everything presented in a way that was easy to understand. I'd definitely use the clinic again and would recommend it to anyone looking for a private female hormone test. Professional service, lovely staff and an all round positive experience.Posted on Google![]()
Anabella Styles9 July 2026Trustindex verifies that the original source of the review is Google.
I had a private gp appointment yesterday as my feet have been swelling every day over the past few days. So I booked an appointment with Dr Heather. Dr Heather explained the possible causes of the swelling, including the heat that we are currently experiencing in London. Recommended further investigation if the swelling persists, to identify the underlying issue rather than just making assumptions.Posted on Google![]()
Mary Anne3 July 2026Trustindex verifies that the original source of the review is Google.
I have used City Walk In Clinic as my go to place for routine blood tests. My recent full health check gave my doctor some clues that i may be approaching my menopause era. So my doctor has recommended that i do some tests to find out if indeed i am entering perimenopause, as the symptoms are there. Will be having my tests in the next few weeks. So glad i had a full health check, because all these symptoms were driving me crazy.Posted on Google![]()
Dona P24 June 2026Trustindex verifies that the original source of the review is Google.
Really good service throughout. Reception staff were welcoming and the blood test was efficient and quick. Highly recommended as blood tests can be booked on the day with results being sent very quickly.Posted on Google![]()
A B23 June 2026Trustindex verifies that the original source of the review is Google.
Great location for blood tests if you want very fast results! I got my results the same day, highly recommend!Posted on Google![]()
Grace Vizcaino2 June 2026Trustindex verifies that the original source of the review is Google.
Very good service at a very reasonable cost. Same day results, I do recommend this clinic and would certainly be using it again.Posted on Google![]()
Shona McGovern16 May 2026Trustindex verifies that the original source of the review is Google.
I attended The Harley Street Walk/in centre in the City recently. I was able to book my appointment the day before for a blood test at a time that suited me. The booking process was straightforward. The doctor that conducted the venous draw was efficient and very pleasant. I have never had such a painless venous draw and I have had many! My appointment was at 5pm and I had my results before 8 am the following day. I will be very happy to book my tests here in the future. Thank you.Posted on Google![]()
Monju Zaman19 April 2026Trustindex verifies that the original source of the review is Google.
Very easy to arrange the appointment with plenty of immediate availability. Very convenient location. Friendly medical associate who took my blood and results arrived very promptly, ie early the next day. Seamless experience.Posted on Google![]()
Nat N17 April 2026Trustindex verifies that the original source of the review is Google.
Attentive, welcoming and professional staff in a great area which is easy to get to! I always feel like I'm in good handsPosted on Google![]()
Abdalla Mohamud Mohamed18 March 2026Trustindex verifies that the original source of the review is Google.
I had a very good experience at the clinic. The staff were punctual friendly and professional. I had a blood test done and received the results quickly on the same day. I would definitely recommend visiting them.Posted on Google![]()
Ena Quinn9 March 2026Trustindex verifies that the original source of the review is Google.
Speedy and efficient place for quick bloods. Results have been same day for me. Very friendly staff too which is always a bonusPosted on Google![]()
Arthur Attwell22 January 2026Trustindex verifies that the original source of the review is Google.
Great experience. I was visiting London from abroad and I needed a blood test before travelling onward. I arrived without an appointment and was done in 20 minutes. The staff were all lovely. I received my test results by email the next morning.Posted on Google![]()
Omar19 January 2026Trustindex verifies that the original source of the review is Google.
Really professional and friendly. They always provide their results quickly!Posted on Google![]()
Antigoni S.17 January 2026Trustindex verifies that the original source of the review is Google.
Very good experience — all the staff were very polite, I was assisted immediately, and the results were available the same day. Thank you very much Private City Clinic!Posted on Google![]()
Sheila Daley31 December 2025Trustindex verifies that the original source of the review is Google.
I wanted a cholesterol check up and chose this clinic because it seemed to offer a competitive price for a detailed report. And so it turned out to be. Received a prompt and professional service at a price that was significantly less than other nearby providers in central London. I have now used it twice and would definitely recommend.Posted on Yell![]()
JenniferP-34418 February 2025Trustindex verifies that the original source of the review is Yell.
I appreciated the discreet and professional care during my sexual health test. The clinic made me feel safe and respected, and the results were delivered quickly and privately. Definitely recommend if you value confidentiality.Posted on Yell![]()
MichelleD-1121 February 2024Trustindex verifies that the original source of the review is Yell.
I can't express enough how pleased I am with the Private Walk-in Clinic. As someone who values privacy and comfort, this clinic hits all the marks. The waiting areas are designed for relaxation, and the staff ensures confidentiality at every step.Posted on Provenexpert![]()
Anonymously4 December 2023Trustindex verifies that the original source of the review is Provenexpert.
The Walk-In Clinic in central London exceeded my expectations in every way. Their attention to detail and commitment to tailored care for their patients truly sets them apart. The availability of evening appointments until 6:30 pm was a game-changer for someone like me juggling multiple commitments.Posted on Yell![]()
LunaW2314 May 2021Trustindex verifies that the original source of the review is Yell.
They are so fast. One call and I am there in a few hours, always the same team and so polite and nice.Posted on Yell![]()
JuliaSf14 October 2020Trustindex verifies that the original source of the review is Yell.
I hope these guys open up again soon because I really cannot stand anyone else around here. they were perfect for me for tests and consultations whenever I needed themPosted on Yell![]()
Emily-M2 August 2019Trustindex verifies that the original source of the review is Yell.
i have used these guys many times in the last 6 years and its always very fast and professional. most tests are done in 24hours and they call you to explain the results. recommended if you gp (like mine) gives you an appointment in 4 weeks time.
We work with experienced consultants & healthcare professionals who have received positive feedback from our patients, and with whom we have established long-term relationships.
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