Levels of Prevention — Primary, Secondary, Tertiary
Overview
The three levels of prevention organize every community and public health nursing intervention. Primary prevention acts BEFORE disease onset in healthy populations to stop disease from ever developing. Secondary prevention acts during EARLY, asymptomatic disease through screening to detect and halt progression. Tertiary prevention acts AFTER disease is established to limit disability, prevent complications, and restore maximum function. The community health nurse applies all three simultaneously, and Healthy People 2030 objectives map measurable national targets to each level.
Three Levels Compare
Sort any intervention by where it falls on the natural history of disease: who is the target, and what is the nurse trying to do?
Primary vs Secondary vs Tertiary Prevention
Primary
- Goal
- Prevent disease before it occurs
- Timing
- Before onset (pre-pathogenesis)
- Target population
- Healthy population
- Examples
- Immunizations, health education, water fluoridation
Secondary
- Goal
- Early detection to halt progression
- Timing
- Early / subclinical / asymptomatic
- Target population
- Asymptomatic at-risk
- Examples
- Mammogram, colonoscopy, BP and glucose screening
Tertiary
- Goal
- Limit disability and rehabilitate
- Timing
- After disease is established
- Target population
- Already diagnosed
- Examples
- Cardiac rehab, diabetes self-management, stroke rehab
Primary Examples
Primary prevention — healthy person + nurse action = stop disease from ever developing.
Secondary Examples
Secondary prevention — asymptomatic person + nurse looking for hidden disease = screening to catch it early.
Tertiary Examples
Tertiary prevention — sick / diagnosed person + nurse preventing further deterioration = rehabilitate and maximize function.
Interpretation
Classification traps the NCLEX repeatedly tests:
Patient Teaching
Population-level health promotion teaching:
Escalate at the population level (lighter report-now for a public health topic):
Clinical Pearl
Primary PREVENTS (before), Secondary SCREENS (early/asymptomatic), Tertiary REHABILITATES (after). Healthy + action = primary; asymptomatic + looking = secondary; sick + limiting damage = tertiary.