The Glasgow coma scale (GCS) is an instrument used by paramedics to measure the decrease in patient awareness. GCS instruments are often used in emergency rooms, intensive care units (ICU), and neurological units. Impairment of consciousness is a dangerous condition for the patient’s life rate and is an indicator of patient death. The purpose of this study was to analyze the competence of ICU nurses to measure the decrease in patient awareness. The research method used was a cross-sectional study which involved 43 ICU nurses, 10 questions about competency to evaluate knowledge and competence. The results showed that years of service had a significant effect on nurses’ competencies in assessing neurology with a p-value of 0.007. Conclusion Assessment of patient awareness is needed so that the competency of nurses needs to be maintained consistency by refreshing new knowledge.