Which color corresponds to the left arm lead in an ECG setup?

• A. White
• B. Black
• C. Green
• D. Red

Answer: (B)

In an ECG setup, the left arm lead is typically represented by the color black. Color coding in ECG leads helps to standardize the placement of electrodes, facilitating proper recording and interpretation of cardiac electrical activity. The standard color scheme follows guidelines set by various medical organizations to ensure consistency across different devices and facilities.

The black color for the left arm is part of the widely recognized system where each limb lead has a specific color: right arm is red, left arm is black, right leg is green, and left leg is yellow. This standardization is essential for clinicians to efficiently set up ECGs without confusion about lead placement, which is critical for accurate diagnostics. Understanding and memorizing this color-coding is important for anyone working with cardiac testing or performing ECG procedures.