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Cardiac Subspecialty Certification (CSC) Exam

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What is specifically recorded by LEAD III on a 12-lead EKG?

  1. The difference in electrical potential between the left leg and left arm electrodes
  2. The difference in electrical potential between the left leg and right arm electrodes
  3. The difference in electrical potential between the left arm and right arm electrodes
  4. The electrical potential at one site relative to zero potential
Explanation

Answer: A - Lead III on a 12-lead EKG measures the difference in electrical potential between the left leg and left arm electrodes.

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