Q.

The number of leads necessary for an ECG is                    

A. 3
B. 6
C. 12
D. 24
Answer» A. 3
Explanation: To have an ECG, the number of leads necessarily needed is 3. These three leads are placed on the four limbs in various combinations to derive the ECG. A 12 lead ECG is used for a greater in-depth analysis. It is used while taking a treadmill test.
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