The Health Utility Index (HUI) is a system used to measure an individual's health status and quality of life. It assigns a numerical value to different health states, allowing for comparisons between various conditions. The HUI takes into account multiple dimensions of health, including physical, mental, and social well-being. HUI scores range from 0 to 1, where 0 represents a health state equivalent to death, and 1 indicates perfect health. This index is often used in health economics and research to evaluate the effectiveness of medical treatments and interventions, helping policymakers make informed decisions about healthcare resources.