Background: In the hospital, sickness severity and worsening were predicted using the Modified Early Warning Score (MEWS). The MEWS makes it possible to detect patient deterioration early, take prompt treatment, and consistently gauge the seriousness of a disease. Objectives: To assess the Modified Early Warning Score (MEWS) in predicting critical care unit admission among emergency department patients. Methodology: Research approach: quantitative approach, descriptive research design was used for 60 samples by convenience sampling techniques. Modified Early Warning Score (MEWS) tool was used to predict critical care admission in emergency department. Result: out of 60 samples, 30(50%) had medium score which infers that key threshold urgent response in critical care unit admission, 16(26.7%) had low score which interprets ward based admission and 14(23.3%) had high score which interprets urgent (or) emergency response admission. Regarding critical care admission in emergency department patients the demographic variables age, education and clinical variable in mechanical ventilator support had shown statistically significant association with Modified Early Warning Score in predicting critical care unit admission among patients in emergency department at p