What is a Health Impact Assessment (HIA) and when is it used?

• A. A systematic process to evaluate potential health effects of policies or projects before they are implemented; used to inform decision-making across sectors.
• B. A clinical trial protocol for testing new vaccines.
• C. A statistical method for adjusting confounders in observational studies.
• D. A method for measuring health literacy levels.

Answer: (A)

Health Impact Assessment is a structured, forward-looking process to evaluate how proposed policies, programs, or projects could affect the health of a population before they are put into action. It looks at health outcomes linked to social, economic, and environmental factors—such as housing quality, air and water quality, transportation options, access to services, and equity concerns—so decisions across sectors can protect and promote health.

Typically, an HIA follows steps like screening whether an impact is worth assessing, scoping which health effects to examine, assessing potential health impacts using evidence and data, developing and implementing recommendations to maximize positive and minimize negative health effects, communicating the findings, and planning for monitoring to see how impacts unfold over time. It brings together stakeholders from different sectors and communities to ensure a broad view of potential consequences and to support more informed, healthier outcomes.

This isn’t a clinical trial protocol for vaccines, nor a statistical method for adjusting confounders in observational studies, nor a tool for measuring health literacy. Those other items describe different methods or purposes: clinical trials test interventions in people, statistical adjustments modify analyses of observational data, and health literacy measures assess individuals’ ability to understand health information.