What is the primary purpose of an EEG?

The primary purpose of an electroencephalogram (EEG) is to assess the electrical activity of the brain. This diagnostic tool helps clinicians detect abnormalities in the brain's electrical activity, which can be indicative of various neurological conditions such as epilepsy, sleep disorders, and brain injuries. By placing electrodes on the scalp, an EEG records the brain's electrical impulses, allowing healthcare providers to analyze patterns of brain waves and identify any irregularities.

While blood pressure, heart function, and respiratory rate are vital signs that provide important health information, they are measured using different instruments and do not relate to the functioning of the brain's electrical systems. Each of those measurements serves a unique purpose in monitoring overall health but does not assess brain activity specifically. The EEG stands out in its ability to offer insights into cognitive function, consciousness levels, and various neurological conditions through the observation of brain wave patterns.