The EQ-5D-5L is a standardized, self-administered questionnaire used to measure health-related quality of life (HRQoL). It is a widely used instrument in both clinical practice and research. The EQ-5D-5L consists of five dimensions: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each dimension has five levels of response: no problems, slight problems, moderate problems, severe problems, and extreme problems.

The EQ-5D-5L is used to assess the general health status of an individual, and to evaluate the effectiveness of interventions such as medical treatments and social care. It can also be used to analyze the costs and benefits of healthcare interventions. The results of the questionnaire can be used to generate a single summary index, the EQ-5D-5L index, which can be used to compare the health status of different groups of people or to monitor changes in an individual's health status over time.

The EQ-5D-5L has been translated into more than 100 languages and is widely used in clinical practice and research in a variety of different settings, including primary care, hospital care, and long-term care. It is considered a valid and reliable measure of HRQoL.