Which color is assigned to the left arm electrode?

In an electrocardiogram (ECG or EKG) setup, the left arm electrode is specifically assigned the color black. This is a standardized color coding system used in many clinical settings to help medical personnel quickly and accurately place electrodes on patients during an ECG procedure.

Understanding the color-coding system is crucial because it ensures consistency and prevents errors in electrode placement, which can lead to inaccurate readings. Each color corresponds to a specific placement area on the patient's body, allowing for clear communication among healthcare providers.

In your choices, while other colors may be used for different areas — such as white for the right arm, red for the left leg, and green for the right leg — black is specifically designated for the left arm according to the common color coding standards used in ECG lead placement. This knowledge is essential for healthcare practitioners to facilitate effective patient care.