How is it measured?
Fainting can happen for several reasons, such as feeling very hot, having a drop in blood sugar levels, or being frightened. When it happens, the person may become pale and sweaty.
They might also feel dizzy or unsteady on their feet. There are three main ways that fainting can be measured: by measuring the person’s pulse (or heart rate), by looking at their skin color (pallor), and by looking at their breathing pattern (changes in respiratory rate).