This document provides guidance on evaluating an acutely ill child in 3 stages: primary, secondary, and tertiary assessment. The primary assessment involves a rapid visual survey checking general appearance, breathing, and circulation. It also involves assessing the child's airway, breathing, circulation, disability, and exposure. Abnormal signs include respiratory rates, heart rates, blood pressures outside normal ranges. The secondary assessment obtains a history of signs/symptoms, allergies, medications, past medical history, and event details. The tertiary assessment may include radiography, blood tests, ECG, ultrasound and other tests. Common causes of altered consciousness in children include respiratory, circulatory or infectious issues. The most probable diagnoses are discussed based on