Situation: The public health nurse of a municipality leads the health program for older persons in a farming barangay, working with the barangay health workers (BHWs) and the senior citizens' association. The nurse lists the activities of the older persons' program. Which activity is SECONDARY prevention?

Secondary prevention detects disease or problems early so they can be treated promptly; screening for depression, vision, and hearing loss fits this level. Exercise programs and vaccination prevent problems from occurring (primary prevention). Rehabilitation with exercises and assistive devices after a fracture limits disability (tertiary prevention).

Levels of Prevention in the Older Persons Program

The question asks you to classify a program activity according to the three levels of prevention. The correct answer is screening for depression, vision, and hearing loss, which is secondary prevention because its purpose is early detection of already-existing but unrecognized problems.

Why Screening Is Secondary Prevention

Secondary prevention does not stop a disease from starting. Instead, it identifies disease or functional decline at an early, often asymptomatic stage so that treatment can begin sooner and outcomes can improve. In the older persons program, screening for depression, vision deficits, and hearing loss fits this definition precisely. These conditions are common in older adults, frequently go unnoticed, and are treatable when detected early.

The rationale is supported by the broader screening literature. A randomized clinical trial of home-based screening for atrial fibrillation in adults aged 75 years or older demonstrated that screening asymptomatic individuals can lead to interventions—such as anticoagulation—that prevent downstream events like stroke ^[2]. The principle is the same: the disease is already present, but the person does not know it, and the screening test is the first step in identifying it.

However, screening in older adults is not automatically beneficial in every case. One review cautions that frail older persons may have less physiological reserve, greater comorbidity, and shorter life expectancy, which can shift the balance away from aggressive follow-up after a positive screen ^[4]. This does not mean screening is wrong; it means the nurse must select screening targets—like depression, vision, and hearing—where early detection leads to practical, low-burden interventions that improve quality of life.

Differentiating the Three Levels

The other options represent primary and tertiary prevention, and the distinction is a high-yield exam point.

Level	Goal	Example from the options	Key feature
Primary prevention	Prevent disease or injury before it occurs	Weekly strength-and-balance exercise sessions; yearly influenza vaccination	Targets healthy or at-risk persons to reduce future incidence
Secondary prevention	Detect existing disease early, before symptoms or complications	Screening for depression, vision, and hearing loss	Disease is already present but unrecognized
Tertiary prevention	Limit disability and improve function after disease or injury	Home exercises and a walker after a hip fracture	Rehabilitation and assistive devices after the event

Watch out! The exercise program in option 1 is primary prevention because it aims to prevent falls and fractures before they happen. But exercise prescribed after a hip fracture—as in option 3—is tertiary prevention because the injury has already occurred and the goal is rehabilitation.

Key point! The timing of the condition relative to the intervention determines the level. If the condition does not yet exist and the goal is to keep it from occurring, it is primary. If the condition exists but is undetected, it is secondary. If the condition has already caused damage and the goal is to restore function or prevent further decline, it is tertiary.

Clinical Application in the Farming Barangay

In a rural, farming community, older persons may have limited access to specialty care, so community-based screening by the public health nurse and BHWs is especially valuable. Vision and hearing screening can identify correctable deficits that contribute to social isolation, falls, and cognitive decline. Depression screening is critical because late-life depression is underrecognized and treatable. The nurse’s role is not only to administer the screening tools but also to ensure that positive results are linked to follow-up care—otherwise screening has no benefit.

The fall-risk screening guideline referenced in one study recommends annual fall risk screening for all adults aged 60 years and older . This reinforces that screening is a standard secondary prevention activity in older adult health programs. At the same time, the nurse should recognize that screening alone does not prevent anything; it is the bridge to early treatment that produces the benefit.