An electrocardiogram, also called an EKG or ECG, is a quick, noninvasive test that records your heart’s electrical activity. It shows how fast your heart beats, whether its rhythm is regular, and how electrical signals travel through your heart.
Small sensors attached to your skin record these signals. The test is painless and does not send electricity into your body.
Why Is an EKG Done?
An EKG helps providers identify abnormal heart rhythms and look for signs of heart muscle damage, including changes associated with a heart attack. It may also help monitor an existing heart condition or the effects of certain medications.
An EKG does not directly measure blood flow or show pictures of the heart. Other tests, such as an echocardiogram, may be needed to assess heart structure, valves and pumping function.
When Might You Need an EKG?
Your provider may recommend an EKG to evaluate:
- A racing, fluttering or irregular heartbeat
- Dizziness or fainting
- Shortness of breath
- Unexplained fatigue or reduced exercise tolerance
- Chest discomfort
An EKG may also be appropriate when monitoring a diagnosed heart condition or evaluating heart health before certain procedures. Your symptoms and medical history guide the decision.
Is an EKG Needed for Routine Screening?
Routine EKG screening is not recommended for adults without symptoms who are at low risk of cardiovascular disease. If you have heart health concerns, your provider can assess your risk and recommend appropriate testing.
How to Prepare for an EKG
A standard resting EKG usually requires little preparation.
- Wear an easy-to-remove top so your chest is accessible
- Avoid lotions, oils and powders on your skin before the test
- Bring a medication list, including supplements
- Do not stop prescribed medication unless your provider instructs you to
- Follow your testing instructions: Exercise EKGs and longer-term monitors may require different preparation
What Happens During the Test?
For a resting EKG:
- You lie on an exam table
- A healthcare professional places adhesive sensors on your chest, arms, and legs. Small areas may need to be shaved to help them adhere
- You remain still while the machine records your heart’s electrical signals
- The sensors are removed
The recording takes only a short time. You may notice mild discomfort when the adhesive patches are removed or temporary skin irritation afterward.
What Do EKG Results Mean?
Your provider reviews the recording alongside your symptoms, medical history, and other findings. An abnormal result may require additional evaluation; it does not always establish a diagnosis on its own.
A resting EKG is a brief snapshot. It can miss rhythm problems that come and go, so your provider may recommend a wearable monitor or additional testing if symptoms persist.
When to Call 911
Call 911 for possible heart attack symptoms, including new chest pressure or discomfort, pain spreading to the arm, back, neck or jaw, or shortness of breath—especially with sweating, nausea or lightheadedness.
Do not wait for a routine appointment or scheduled EKG.
Talk With Us About Your Heart Health
Have non-emergency concerns about your heartbeat or whether you need an EKG? Schedule a visit with tru Primary & Urgent Care to discuss your symptoms and appropriate next steps.
