EKG (also called ECG) is short for electrocardiogram. Electro refers to the heart's natural electrical activity, which the test records through small wires taped on your chest. (Don't worry, you won't feel a thing.) This video shows what it's like. Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.