Where is the ground electrode placed on a standard 12-lead EKG?

Where is the ground electrode placed on a standard 12-lead EKG?

• A. Right Arm
• B. Right Leg
• C. Left Leg
• D. Left Arm

Answer: (B)

In an ECG, the ground (reference) electrode provides a stable baseline and helps reduce electrical noise so the heart’s signals are measured cleanly. For a standard 12-lead setup, the ground is placed on the right leg. This location keeps the reference away from the active lead sites (arms and chest), minimizes movement-related artifacts, and supports the safety and stability of the recording. The other limb positions (right arm, left arm, and left leg) are used for the limb leads and augmented leads, but they aren’t used for grounding.

In an ECG, the ground (reference) electrode provides a stable baseline and helps reduce electrical noise so the heart’s signals are measured cleanly. For a standard 12-lead setup, the ground is placed on the right leg. This location keeps the reference away from the active lead sites (arms and chest), minimizes movement-related artifacts, and supports the safety and stability of the recording. The other limb positions (right arm, left arm, and left leg) are used for the limb leads and augmented leads, but they aren’t used for grounding.