In evidence-based practice, what does PICO stand for? And how is it used?

• A. Population, Intervention, Comparison, Outcome; used to frame clinical questions to guide literature search
• B. Problem, Intervention, Context, Outcome; used to guide patient care
• C. Population, Intervention, Comparison, Outcome; used to guide literature search for research
• D. Population, Intervention, Control, Outcome; used to schedule care

Answer: (A)

PICO is a framework used in evidence-based practice to shape clinical questions and guide your literature search by identifying four elements: Population (who is being studied), Intervention (the treatment or exposure), Comparison (the alternative or standard), and Outcome (the effect you want to measure). By explicitly naming these parts, you craft a precise, searchable question and generate key terms that help you find relevant studies, guidelines, or systematic reviews to inform patient care.

This option matches the standard PICO structure and the purpose of using it: framing the clinical question so you can efficiently search for evidence that will guide decision-making in practice. The other options mix in nonstandard terms like Context or Problem or use a term like Control, which isn’t the conventional component of PICO, and they describe guiding care in less precise ways.