This document discusses measuring health and the social determinants of health. It defines social determinants of health as the conditions where people are born, live, work and age that are shaped by economic, social and political systems. These social determinants have the greatest impact on health and health inequities. The WHO argues that unequal distribution of power, money and resources globally and nationally are the underlying social causes of poor health and health inequities. Measuring social determinants of health and vulnerable groups is important for understanding health status and needs.