Which function best describes the role of GIS in public health?

• A. Provide lab assay results for contaminants
• B. Visualize spatial patterns, identify hotspots, plan resource allocation, and track environmental exposures
• C. Manage payroll
• D. Diagnose individual patients

Answer: (B)

GIS in public health is about mapping and analyzing geographic data to reveal patterns and guide action. By layering information such as disease counts, population demographics, environmental hazards, and locations of health services on a map, GIS helps visualize where health issues cluster, identify hotspots, and plan where to allocate resources or deploy interventions. It also helps track environmental exposures by showing how they vary across spaces, which supports targeted prevention and response efforts. For example, mapping asthma triggers or lead exposure by neighborhood can highlight communities in need and help prioritize outreach or remediation.

Lab assay results for contaminants come from laboratory testing and are typically analyzed in lab data systems rather than through spatial analysis. Managing payroll is an administrative task unrelated to population health patterns. Diagnosing individual patients is clinical care focused on the person, whereas GIS targets patterns and decisions at the population level to improve community health outcomes.