What is the normal standard height in millimeters for an EKG?

The normal standard height for an EKG is set at 10 millimeters per vertical division. This is established to ensure consistent and accurate readings across different EKG machines and strips. When the EKG paper moves at a speed of 25 millimeters per second, this standard height means each 10-millimeter deflection represents a certain voltage level, usually 1 millivolt. This standardization is crucial for physicians to effectively compare and interpret the EKG readings, as consistent amplitudes and timing help in diagnosing various cardiac conditions.

The other options—5 millimeters, 8 millimeters, and 12 millimeters—do not align with the established convention for EKG measurements, which is why they would not be considered the correct standard. The 10-millimeter standard ensures that health professionals can rely on the amplitude of the EKG waves in their diagnostic process.