Certified EkG technician (CET) Practice Exam

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During a 5-lead EKG, which limb should be checked if leads 2 and 3 are not yielding a reading?

Left arm
Right arm
Right leg
Left leg

The correct answer is: Left leg

In a 5-lead EKG setup, the leads are placed on specific locations to capture the electrical activity of the heart accurately. If leads 2 and 3 are not yielding a reading, the logical approach is to check the left leg, which is designated for the placement of the ground lead or the reference point in this configuration. This leg helps to stabilize the other readings and ensures the correct functioning of the lead connections. When leads 2 and 3 are not working properly, it might indicate an issue with the corresponding lead connections or a problem with grounding. Since the left leg acts as both a ground and an important part of limb lead configuration, verifying its connection can resolve the issue. Ensuring that the lead on the left leg is securely attached and functioning can help restore the intended readings from leads 2 and 3.