Consciousness level shows the individual’s reflection to the environmental stimulants. However, finding the unusual consciousness situations seems to be difficult and might be determined by observing the reflection of individual to stimulants. Primary evaluation of brain operation indirectly appoints the brain oxygenation. Some references have classified consciousness level as a part of vital signs. The assessment of consciousness level is considered as a fundamental skill for physicians and nurses. Consciousness level disorders might be caused by some reasons such as decreasing in the brain oxygenation, neurologic, metabolic and poisonings. Evaluation the position of patient and its organs, having opened or closed eyes, patient’s perception of the others existence, patient’s ability to open the eyes voluntarily or by external stimulation are among factors which help specialists to determine the consciousness level. Although Glasgow Coma Scale (GCS) is known and used as a current global scale to evaluate the consciousness level and brain trauma, this scale sometimes has been measured wrongly. Accordingly, evaluation of the consciousness level shouldn’t be restricted to GCS, and utilizing some additional four-dimensioned methods such as ACDU and AVPU seems to be appropriate. In this paper various methods for determining the consciousness level of injured people have been discussed.