What does a small box on an ECG measure?

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Prepare for the West-MEC Medical Assisting Technical Skills Assessment. Study with flashcards and multiple choice questions, with comprehensive hints and explanations. Get exam ready!

Multiple Choice

What does a small box on an ECG measure?

Explanation:
On ECG paper, the tracing is drawn on a grid where each tiny square is 1 millimeter wide and tall. That means a small box measures 1 mm. Each small box also represents 0.04 seconds of time horizontally and 0.1 millivolts of voltage vertically, while a larger box (made of 5 by 5 small boxes) is 5 mm per side. So the correct idea is that a small box is 1 mm in size; the other numbers correspond to the size of larger boxes or different units, not the small box itself.

On ECG paper, the tracing is drawn on a grid where each tiny square is 1 millimeter wide and tall. That means a small box measures 1 mm. Each small box also represents 0.04 seconds of time horizontally and 0.1 millivolts of voltage vertically, while a larger box (made of 5 by 5 small boxes) is 5 mm per side. So the correct idea is that a small box is 1 mm in size; the other numbers correspond to the size of larger boxes or different units, not the small box itself.

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