Certified EKG Technician (CET) Practice Exam 2025 - Free EKG Technician Practice Questions and Study Guide.

For a standard 12-lead EKG, lead V4 is correctly placed in the fifth intercostal space at the midclavicular line. This position allows V4 to accurately capture the electrical activity of the heart, particularly the anterior wall of the left ventricle.

The placement in the fifth intercostal space at the midclavicular line aligns with the standardized guidelines established by the American Heart Association for the proper positioning of the precordial leads. Correct positioning of V4 is crucial for diagnosing conditions related to left ventricular function and other cardiac issues. By placing V4 in this specific position, the EKG can provide clear and reliable data for interpretation.