How an Echocardiogram Is Done, How Long It Takes, and Echo vs ECG

The room is dimmer than you expect. A screen glows to your left, the gel is colder than anyone warned you, and the sonographer says something like, “I’m just going to tuck this under the edge of the gown.” Then the sound starts: a rhythmic whoosh-whoosh that turns out to be your own blood moving through a valve you have never thought about.

That is the moment most women remember about their first echocardiogram, and it is also the moment most patient leaflets skip. They explain the physics of ultrasound and forget the practical questions: How much of my chest is uncovered? Do I need to stop eating? Is this the same as the sticky-electrode test I had in the emergency department?

Those questions deserve straight answers grounded in what the evidence and mainstream clinical guidance actually say, so this guide walks through the scan the way it really unfolds, from the waiting room to the report.

What does an echocardiogram actually show?

An echocardiogram, or “echo,” is an ultrasound of the heart. A handheld probe sends high-frequency sound waves into the chest; the waves bounce back off heart tissue and blood, and a computer turns the returning echoes into moving pictures. The same technology is used to image a baby during pregnancy, which is why many women find the equipment oddly familiar.

What the cardiologist is looking for is structure and motion. The Mayo Clinic describes the test as a way to see the size and shape of the heart, how thick the walls are, how well each chamber pumps, and whether the four valves open and close properly. Color Doppler, an added layer that paints blood flow red and blue on screen, shows whether blood is leaking backward through a valve or squeezing through one that has narrowed.

That makes an echo the go-to test when a doctor hears a murmur, when someone has unexplained breathlessness or swollen ankles, or when a condition already known about, such as a valve problem or heart failure, needs monitoring over time. It is also used after a heart attack to see how much of the muscle is still contracting well.

Notice what is not on that list: coronary arteries. A standard echo does not directly image the small vessels on the heart’s surface, a point that surprises many patients and that deserves its own section further down.

How is an echocardiogram done on a woman, step by step?

The procedure is essentially the same for everyone, but a few details matter more for women, so it helps to know the order of events.

You will be asked to remove clothing from the waist up, including your bra, and to put on a gown that opens at the front. A sonographer, sometimes called a cardiac physiologist, attaches three or so small sticky electrodes to your chest so the machine can track your heart rhythm during the scan. You then lie on a padded couch, usually on your left side with your left arm resting above your head. That position lets the heart fall closer to the chest wall and slide out from behind the lung, giving a clearer picture.

Gel goes on the probe, and the sonographer presses it against several “windows”: just left of the breastbone, at the tip of the heart under the left breast, in the notch at the base of the throat, and sometimes under the ribs at the top of the abdomen. You may be asked to breathe out and hold for a few seconds, or to roll slightly onto your back.

Throughout, you will hear whooshing sounds and see flickers of color on the screen. The sonographer is capturing dozens of short video clips and still frames, then measuring them. Firm pressure is normal; sharp pain is not, and you should say so. When enough good images are stored, the gel is wiped away, the electrodes come off, and you dress. The NHS notes that most people can go home and return to normal activities straight afterward.

Will my breasts be exposed during an echocardiogram?

This is one of the most common questions women type into a search bar before the appointment, and it deserves a direct answer: partially, yes, but not fully, and not for the whole scan.

The heart sits behind the lower left chest wall, so the most important imaging window is beneath the left breast, near the spot where a stethoscope goes. To reach it, the sonographer needs to slide the probe under the breast tissue or gently lift the breast with the edge of the gown or a towel. The right breast usually stays covered, and the gown or a sheet is repositioned each time the probe moves. Experienced staff do this quickly and matter-of-factly; it is a routine part of their day.

You are entitled to ask for things that make you more comfortable. Requesting a female sonographer is reasonable, and many departments can arrange it if asked when booking. Asking for a chaperone, keeping your own cardigan draped over your shoulders, or asking the sonographer to explain each move before it happens are all normal requests.

Women with larger breasts sometimes worry that they will “ruin” the pictures. Breast tissue can make images harder to obtain, but sonographers train for exactly this and have techniques, including different probe angles and asking you to shift position, that usually solve it. Breast implants do not prevent an echo; the sonographer simply works around them. If an image window is truly poor, the cardiologist may suggest a different type of echo rather than sending you away without an answer.

How long does an echocardiogram take?

Plan for the appointment, not just the scan. According to the NHS, a standard transthoracic echocardiogram usually takes between 15 and 60 minutes; the Mayo Clinic puts the typical session at around an hour once you include changing, electrode placement, and image capture.

Why such a wide range? Several things stretch or shrink the time:

• The reason for the scan. A follow-up check of a known valve needs fewer views than a first-time work-up of unexplained breathlessness.
• Image quality. Lung disease, a deep chest, or breast tissue can make some windows hard to find, and the sonographer may need extra angles.
• Additional measurements. Strain imaging or three-dimensional views, increasingly used in some centers, add minutes.
• Your ability to hold still and hold a breath for a few seconds at a time.

Other echo types run to different clocks. A stress echocardiogram involves resting images, exercise on a treadmill or bike (or a medicine that mimics exercise), then a second set of images, so most of the visit is preparation and recovery rather than scanning. A transesophageal echo, where a small probe is passed down the throat, involves sedation and a monitored recovery period, so you should expect to be in the department for several hours and to have someone drive you home.

The honest answer to “how long” is therefore: the scan itself is often under half an hour, but block out at least an hour of your day for a standard echo and half a day for the specialized versions.

What should you not do before an echocardiogram?

For a standard echocardiogram through the chest wall, the reassuring truth is that there is very little to avoid. Both the NHS and the Mayo Clinic say you can eat, drink, and take your usual medicines as normal, and no fasting is required. The only practical tips are to wear clothing that is easy to remove from the waist up, skip body lotion or oil on the chest that morning because it can interfere with the gel and the electrodes, and leave necklaces at home.

The picture changes for the two specialized versions.

Before a stress echocardiogram, the Mayo Clinic advises not eating or drinking anything except water for a few hours beforehand, and your care team may ask you to avoid caffeine on the day, since it can affect heart rate and the reading. Bring comfortable shoes and clothes you can exercise in. Some heart medicines are paused for the test because they blunt the heart rate response; whether to stop any tablet is a decision for the prescribing clinician, so ask rather than guess.

Before a transesophageal echocardiogram, you will be told to stop eating and drinking for several hours, because the probe passes into the esophagus under sedation and an empty stomach reduces the risk of vomiting. Dentures are removed, and you must arrange someone to accompany you home, as the sedative impairs judgment and coordination for the rest of the day.

One universal suggestion: bring a written list of your symptoms and medicines. The sonographer records your history, and specifics such as “breathless after one flight of stairs” or “palpitations mostly at night” help the cardiologist interpret the pictures.

Echo vs ECG: what is the difference?

The two tests are confused constantly, partly because both involve sticky electrodes and both are ordered for chest symptoms. They answer completely different questions.

An electrocardiogram (ECG, sometimes EKG) records the heart’s electrical activity through electrodes on the chest, arms, and legs. The NHS describes it as a test that takes about five minutes, is painless, and produces a paper or digital tracing of heart rhythm and electrical timing. It is excellent at catching rhythm problems, signs of a heart attack in progress, and clues to strain or previous damage. It shows nothing about how the valves look or how forcefully the muscle squeezes.

An echocardiogram is an image. It cannot diagnose an arrhythmia in the way an ECG can (although the small rhythm strip running during the scan helps time the pictures), but it can show a leaking valve, a thickened wall, fluid around the heart, or a weakly pumping chamber that an ECG would only hint at.

Feature	ECG	Echocardiogram
What it measures	Electrical activity and rhythm	Structure, valves, blood flow, pumping
Typical duration	About 5 minutes (NHS)	15 to 60 minutes (NHS)
Undressing	Chest, wrists, ankles accessed	Waist up, gown provided
Preparation	None	None for standard; fasting for stress or transesophageal
Who performs it	Nurse, technician or doctor	Sonographer; cardiologist reports
Radiation	None	None

In practice the two are partners. A doctor often orders an ECG first because it is quick and available anywhere, then an echo to explain what the ECG raised.

What are the different types of echocardiogram?

When a doctor says “we’ll get an echo,” they usually mean the transthoracic version described above, where the probe stays on the outside of the chest. Three other forms exist, each chosen for a specific reason.

A stress echocardiogram compares the heart at rest with the heart under load. You exercise on a treadmill or stationary bike until your heart rate reaches a target, or, if you cannot exercise, a medicine given through a vein makes the heart beat faster and harder for a few minutes. Images taken immediately afterward show whether any part of the heart wall stops moving well when demand rises, which is an indirect sign that a coronary artery is not delivering enough blood. The Mayo Clinic notes this is a standard way to investigate suspected coronary artery disease when a plain echo looks normal.

A transesophageal echocardiogram (TEE) uses a slim probe on a flexible tube passed down the throat into the esophagus, which lies directly behind the heart. Because no ribs or lung tissue get in the way, the pictures are sharper. It is used to look closely at valves, to search for clots before certain heart procedures, and to check for infection on a valve. Your throat is numbed with a spray and a sedative helps you relax; most people remember little of it.

A contrast echocardiogram adds a small injection of harmless microbubbles into a vein so the inside of the heart chambers stands out more clearly, useful when the standard images are faint.

Which one you have is a decision for the cardiology team, weighed against your symptoms and the quality of the first pictures.

Does an echocardiogram hurt, and is it safe?

A standard echo is one of the safest tests in medicine. Ultrasound uses sound waves, not ionizing radiation, so unlike an X-ray or a CT scan there is no dose to add up over a lifetime. The Mayo Clinic and MedlinePlus both describe the transthoracic echo as carrying no known risks, and it is routinely performed during pregnancy when a heart problem needs assessing in the mother.

Discomfort is minor and mostly about pressure and position. Lying on your left side for half an hour with an arm over your head can make a shoulder ache, and the probe pressed between the ribs can feel like a firm thumb. The electrodes may tug a little on removal. If you have a chest wall injury, recent surgery, or a very tender breast, tell the sonographer beforehand so they can adapt.

The specialized versions carry small, specific risks that your team will explain in detail:

• Stress echo: exercising to a target heart rate can occasionally trigger a rhythm disturbance or chest pain, which is why a doctor is present and resuscitation equipment is in the room.
• Transesophageal echo: a sore throat for a day is common; rare complications include damage to the esophagus or a reaction to the sedative.
• Contrast echo: allergic reactions to the microbubble agent are uncommon but possible.

Breast implants, pacemakers, and metal in the body are not barriers to an echo. Nor is menstruation or breastfeeding. If you are pregnant or could be, mention it, mainly so that a stress or contrast test can be planned appropriately.

Can an echocardiogram show blockages in your heart?

Not directly, and this is the most important misunderstanding to clear up. The coronary arteries that become narrowed in heart disease are only a few millimeters wide and run along the outer surface of the heart, moving with every beat. A transthoracic echo simply does not have the resolution to show plaque inside them.

What an echo shows is the consequence of a blockage. Heart muscle that has been starved of blood in a past heart attack becomes thin and stops contracting; on the screen this appears as a segment of wall that does not thicken and move inward with the rest. A cardiologist reading the scan can often say which artery territory has been affected. A stress echo takes this a step further: if a wall segment moves normally at rest but weakens during exercise, that is evidence of an artery that cannot keep up with demand.

For a direct look at the arteries themselves, doctors turn to other tools. A CT coronary angiogram uses X-rays and contrast dye to picture the arteries; a cardiac catheterization threads a fine tube to the heart and injects dye under X-ray guidance. Each has its own risk profile, and the choice depends on how likely a blockage is thought to be. The AHA describes echocardiography as one part of a broader diagnostic pathway rather than a stand-alone test for blocked arteries.

This matters particularly for women, in whom chest pain is more often linked to problems in the very small vessels of the heart muscle, sometimes called microvascular disease. Those vessels are invisible on every standard imaging test, so a “normal echo” does not always mean “nothing is wrong,” and persisting symptoms should be revisited with the doctor rather than dismissed.

Do you get echocardiogram results straight away?

Usually not in full, and understanding why saves frustration. The sonographer capturing your images is highly trained and often has a clear idea of what they are seeing, but in most systems they are not the person who issues the formal report. That job belongs to a cardiologist, who reviews every clip, checks the measurements, and writes an interpretation in the context of your history and any previous scans.

The NHS explains that the images are analyzed and the results sent to the doctor who requested the test, and that this can take some time, with the requesting clinician then discussing the findings with you. The Mayo Clinic similarly notes that results are shared at a follow-up appointment or through a message from your care team.

There are exceptions. If the sonographer spots something that needs urgent attention, such as a large collection of fluid around the heart, they will flag it to a doctor immediately, and you would not be sent home without being told. In hospital settings, where an echo is done at the bedside, a cardiologist may read it the same day. Some outpatient clinics schedule the scan and the consultation back to back so you leave with an answer.

If you ask the sonographer “how did it look?” you may get a cautious, general reply. That caution is professional, not evasive. Rather than pressing, ask two practical questions: who will contact me with the results, and roughly when? Then note it down. A clear timeline is the best antidote to the anxious week of waiting that many people describe.

What do the numbers on an echocardiogram report mean?

Echo reports arrive dense with abbreviations. A few recur in almost every one and are worth recognizing so the conversation with your doctor starts from understanding rather than alarm.

Ejection fraction (EF or LVEF) is the headline figure: the percentage of blood in the left ventricle that is pushed out with each beat. The American Heart Association describes a normal range of roughly 55% to 70%, with lower values indicating the pump is working less forcefully than expected and prompting further assessment. A normal EF does not rule out heart failure, because some people, and disproportionately women, have a stiff ventricle that fills poorly while still ejecting a normal fraction; the report may describe this as “diastolic dysfunction.”

Valve findings are usually graded as trivial, mild, moderate, or severe. Trivial or mild leakage of a valve is extremely common in healthy people and often needs nothing more than a note in the record. Moderate or severe grades are what drive follow-up.

Chamber sizes and wall thickness are measured in millimeters and compared with normal ranges adjusted for body size. “Left ventricular hypertrophy” means the muscle wall is thicker than expected, frequently a consequence of long-standing high blood pressure.

Pericardial effusion means fluid in the sac around the heart, and pulmonary artery pressure estimates how hard the right side of the heart is working.

None of these numbers is a diagnosis on its own. The cardiologist reads them against your symptoms, your ECG, and your history, and that combined judgment, not the isolated figure, guides what happens next.

Why are echocardiograms so often ordered for women's heart symptoms?

Heart disease in women has a long history of being under-recognized, and part of the reason is that symptoms often differ from the textbook picture. The AHA notes that women having a heart attack are more likely than men to experience shortness of breath, nausea, unusual fatigue, and discomfort in the back, neck, or jaw, sometimes with little or no crushing chest pain. Those symptoms overlap with anxiety, indigestion, and menopause, so a woman may be reassured several times before anyone looks at her heart.

An echo is a natural next step because it is safe, radiation-free, widely available, and answers a broad set of questions in one sitting. It can show whether breathlessness is coming from a weak or stiff pump, whether swollen ankles reflect a struggling right ventricle, whether palpitations are accompanied by a structural cause, and whether a murmur first noticed during pregnancy has a valve behind it.

Certain life stages bring specific reasons. Pregnancy increases blood volume and cardiac output substantially, and a small number of women develop weakening of the heart muscle around delivery, a condition called peripartum cardiomyopathy that is diagnosed on echo. Some cancer treatments can affect heart muscle, so women receiving them may have scheduled echoes to monitor pumping strength. After menopause, the rise in blood pressure and cholesterol risk makes structural checks more common.

The takeaway is not that every woman needs an echo. It is that vague, persistent symptoms in a woman deserve the same structured investigation they would receive in a man, and an echocardiogram is frequently the most informative, least invasive place to begin.

Can you have an echocardiogram while pregnant, and what is a fetal echo?

Two different scans share the word “echocardiogram” in pregnancy, and search results tend to blur them.

The first is an echo of the mother’s heart. It is done exactly as described earlier, is considered safe at any stage of pregnancy because it uses ultrasound rather than radiation, and is ordered when a pregnant woman has breathlessness beyond what is expected, a new murmur, palpitations, fainting, high blood pressure complications, or a known heart condition that needs monitoring as the circulation adapts. Lying on the left side, the standard echo position, is also the position most pregnant women find most comfortable, and it improves blood return to the heart in later pregnancy.

The second is a fetal echocardiogram: a detailed ultrasound of the baby’s heart, performed through the mother’s abdomen, usually in the second trimester. It is offered when a routine anomaly scan raises a question about the heart, when there is a family history of congenital heart disease, when the mother has certain conditions such as diabetes, or when a genetic finding increases risk. A specialist in fetal or pediatric cardiology performs or supervises it, and the appointment often takes longer than a routine scan because the baby’s position dictates what can be seen.

Neither test involves needles, dye, or preparation beyond a full or empty bladder as instructed for the fetal version. If you are unsure which one has been booked, ask; the letter may say only “echocardiogram,” and knowing whose heart is being scanned makes the appointment far less daunting.

When should you see a doctor about heart symptoms?

An echocardiogram is a planned test, but the symptoms that lead to it sometimes cannot wait for an appointment. Knowing the difference is more useful than any detail about probes and gel.

Call emergency services immediately if you or someone else has chest pain or pressure lasting more than a few minutes or coming and going, pain spreading to the arm, jaw, neck, or back, sudden severe breathlessness, fainting or near-fainting, or a fast irregular heartbeat with dizziness. The AHA stresses that women should not talk themselves out of calling because the pain is “not that bad” or is accompanied by nausea and fatigue rather than the classic clutch-the-chest picture. Minutes matter for heart muscle, and paramedics can begin an ECG on the way.

Book a prompt appointment with your doctor, within days rather than weeks, for breathlessness that is new or worsening with everyday activity, waking at night short of breath, needing extra pillows to sleep, swelling of the ankles or legs that is getting worse, palpitations that keep recurring, or exercise tolerance that has dropped noticeably. A murmur mentioned in passing at a routine check also deserves follow-up rather than a shrug.

Bring specifics. Note when symptoms happen, what brings them on, how long they last, and what eases them. A doctor deciding between an ECG, an echo, blood tests, or urgent referral relies on that pattern.

Finally, a normal echocardiogram that leaves symptoms unexplained is not the end of the road. Go back, say the symptoms persist, and ask what the next step is. The treating team decides the pathway, but persistence from the patient is often what keeps a diagnosis moving.

Frequently asked questions

Will my breasts be exposed during an echocardiogram?

Partially. You remove your bra and wear a front-opening gown, and the sonographer needs to place the probe beneath the left breast because the heart sits behind the lower left chest. The right breast normally stays covered and the gown is repositioned as the probe moves. You can ask for a female sonographer, a chaperone, or a running explanation of each step, and most departments accommodate these requests readily.

What should you not do before an echocardiogram?

For a standard echo, nothing special: eat, drink, and take medicines as usual, though skipping chest lotion helps the gel and electrodes stick. Before a stress echo, avoid food for a few hours and caffeine on the day unless told otherwise. Before a transesophageal echo, you must not eat or drink for several hours because of the sedation. Never stop a heart medicine without the prescriber’s instruction.

Can an echocardiogram show blockages in your heart?

Not directly. The coronary arteries are too small and mobile for a standard ultrasound to image plaque inside them. An echo shows the consequences of blockage, such as a segment of heart wall that no longer contracts after a heart attack, or, on a stress echo, a wall that weakens when the heart works harder. To see the arteries themselves, doctors use CT coronary angiography or cardiac catheterization.

Do you get echocardiogram results straight away?

Usually not in full. The sonographer records the images, but a cardiologist reviews and formally reports them afterward and sends the result to the doctor who ordered the test, who then discusses it with you. Urgent findings are flagged immediately and you would not be sent home uninformed. Ask before leaving who will contact you and roughly when, so you have a clear timeline.

How long does an echocardiogram take from start to finish?

The NHS says a standard transthoracic echo takes between 15 and 60 minutes; allow about an hour for the appointment including changing and electrode placement, as the Mayo Clinic suggests. A stress echo involves exercise and recovery, so plan for longer, and a transesophageal echo with sedation means several hours in the department plus someone to take you home.

Is an echocardiogram painful?

No. You may feel firm pressure as the probe is pressed between the ribs and some aching from lying on your left side with an arm raised, but the test is not painful. Tell the sonographer if you have a tender breast, recent surgery, or a chest injury so they can adjust. Sharp pain is unexpected and worth mentioning immediately during the scan.

Can I have an echocardiogram with breast implants?

Yes. Implants do not prevent an echocardiogram and pose no safety concern with ultrasound. They can make some imaging windows a little harder to obtain, so the sonographer may use different angles or ask you to shift position. If the images remain limited, the cardiologist may suggest a contrast echo or another view rather than leaving the question unanswered.

What is the difference between an echo and an ECG?

An ECG records the heart’s electrical activity through electrodes and takes about five minutes; it detects rhythm problems and signs of a heart attack. An echocardiogram is an ultrasound picture of the heart taking 15 to 60 minutes; it shows valve function, wall movement, chamber size, and pumping strength. Doctors often order the quick ECG first and the echo to explain what it raises.

Is an echocardiogram safe during pregnancy?

Yes. A transthoracic echo uses sound waves rather than radiation and is routinely performed on pregnant women who develop breathlessness, palpitations, a murmur, or blood pressure complications, or who have a known heart condition. It is separate from a fetal echocardiogram, which images the baby’s heart through the abdomen. Mention pregnancy so that any stress or contrast version is planned appropriately by your team.

What is a normal ejection fraction on an echocardiogram?

The American Heart Association describes roughly 55% to 70% as the normal range for left ventricular ejection fraction, meaning that share of blood leaves the main pumping chamber with each beat. Lower values prompt further assessment. A normal figure does not rule out heart failure, because a stiff ventricle that fills poorly can still eject a normal fraction; your cardiologist interprets the number alongside your symptoms.

References

• Echocardiogram: NHS
• Electrocardiogram (ECG): NHS
• Echocardiogram: MedlinePlus Medical Encyclopedia
• Echocardiogram (Echo): Cleveland Clinic

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.