Which statement best describes the RL (ground) lead in a 12-lead ECG?

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Multiple Choice

Which statement best describes the RL (ground) lead in a 12-lead ECG?

Explanation:
In a 12-lead ECG, the RL electrode acts as the ground/reference, providing a stable return path for the signals and helping reduce electrical noise and improve safety. Because it serves as the reference rather than as a signal source, it does not generate its own trace on the ECG—hence it’s described as the ground lead with no trace. It isn’t used to record a limb signal, and the chest leads V1-V6 are measured with a different reference based on the Wilson central terminal, not RL. The RL electrode is placed on the right leg, not the left arm.

In a 12-lead ECG, the RL electrode acts as the ground/reference, providing a stable return path for the signals and helping reduce electrical noise and improve safety. Because it serves as the reference rather than as a signal source, it does not generate its own trace on the ECG—hence it’s described as the ground lead with no trace. It isn’t used to record a limb signal, and the chest leads V1-V6 are measured with a different reference based on the Wilson central terminal, not RL. The RL electrode is placed on the right leg, not the left arm.

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