Where Primary Ends and Secondary Begins: Type 2 Diabetes and the Blurred Edges of the Three Levels of Prevention
Student Name
American College of Education
NUR4073: Health Promotion
Module 1 Assignment
Instructor Name
November 2, 2026
The Three Levels
The levels of prevention were set out by Leavell and Clark (1965) as a way of organizing health activities around the natural history of disease. Primary prevention acts before a disease begins, through health promotion and specific protection, to reduce the chance that it develops at all. Secondary prevention acts after the disease process has started but before it causes symptoms or serious harm, mainly through early detection and prompt treatment. Tertiary prevention acts once disease is established, limiting disability and complications and restoring function. The framework is simple enough to memorize and precise enough to be useful, but its categories were designed around the course of a disease, and diseases do not always follow a clean course.
Type 2 diabetes is a good condition for testing the framework because it has a long, measurable path from normal glucose metabolism through prediabetes to diagnosed diabetes and then to complications affecting the eyes, kidneys, nerves and feet. Each stage offers something a nurse can do, and each transition raises a question about which level of prevention the intervention belongs to. Diabetes shows the three levels clearly in the middle of each stage and poorly at the edges, which is where the most interesting nursing work happens.
One Condition, Three Levels
Primary prevention of type 2 diabetes addresses its main modifiable risk factors, excess weight and physical inactivity, before any abnormality of glucose metabolism appears. Community programs that make physical activity easier, school nutrition standards and workplace wellness efforts belong here. For an individual nurse, primary prevention might mean counseling a 35-year-old with a family history of diabetes and a body mass index of 29 about weight and activity while their glucose is still normal.
Secondary prevention detects diabetes or its precursor early, when treatment can change the course. Federal preventive guidance calls for checking blood glucose in adults between 35 and 70 whose weight is above the healthy range, and for sending anyone found to have prediabetes to a proven prevention program (U.S. Preventive Services Task Force [USPSTF], 2021). Screening is the clearest example of secondary prevention in the framework: it finds disease or a precursor that the person does not yet know about.
Tertiary prevention applies once diabetes is diagnosed and aims to prevent or limit complications. Glycemic, blood pressure and lipid management reduce the risk of damage to blood vessels and nerves, and the American Diabetes Association Professional Practice Committee (2025) recommends annual comprehensive foot evaluation, regular screening for retinopathy and education in daily foot care. Each of these activities accepts that the disease is present and works to keep it from causing blindness, amputation or kidney failure.
Boundary One: Lifestyle Programs for Prediabetes
The first boundary appears when a screening test finds prediabetes. The person does not have diabetes, so an intervention to stop diabetes from developing looks like primary prevention. Yet the intervention is triggered by a screening result that has already detected an abnormality, which makes it part of secondary prevention's logic of early detection and prompt action.
The evidence for acting at this point is strong. In the Diabetes Prevention Program, adults with elevated fasting and post-load glucose were randomly assigned to an intensive lifestyle intervention aimed at 7 percent weight loss and 150 minutes of physical activity a week, to metformin or to placebo. After an average follow-up of 2.8 years, the lifestyle intervention reduced the incidence of diabetes by 58 percent and metformin by 31 percent compared with placebo (Diabetes Prevention Program Research Group, 2002). The intervention is primary prevention of diabetes and secondary prevention of the disordered metabolism that precedes it, and both descriptions are correct.
How the boundary is drawn has practical consequences. If the program is classified as primary prevention, its funding may compete with community wellness programs; if it is classified as a response to a screening finding, it may be covered as part of care for an identified condition. The label changes who pays and where the program sits in a health system.
Boundary Two: Foot Examinations After Diagnosis
The second boundary appears after diagnosis. An annual foot examination in a person with diabetes looks like tertiary prevention, because the disease is established. But the examination is itself a screening test: it looks for loss of protective sensation, reduced pulses and deformity before any ulcer has formed. Relative to the complication it targets, a foot ulcer and eventual amputation, the examination is secondary prevention, detecting early neuropathy while the foot is still intact.
Once an ulcer has formed, wound care, offloading and infection control are tertiary prevention of amputation, and teaching the person to inspect their feet daily is secondary prevention of the next ulcer. The same foot, in the same year, can be the site of all three levels depending on which outcome is in view. The levels of prevention are not properties of an intervention; they describe the relationship between an intervention and a specific disease outcome.
Why the Classification Matters
The boundaries might look like a question of vocabulary, but classification changes how an intervention should be evaluated. A primary prevention program is judged by how many new cases it prevents in a population that is currently healthy, so it needs large numbers and long follow-up. A secondary prevention activity is judged by whether it finds disease early enough for treatment to change the outcome, so its sensitivity and the availability of effective treatment matter. A tertiary prevention activity is judged by complications prevented and function preserved among people who already have the disease.
For a nurse planning health promotion, naming the outcome first and then placing the intervention in relation to it avoids a common error: judging a foot examination program by whether it reduces the incidence of diabetes, or judging a community walking program by whether it heals ulcers. Knowing where an intervention sits tells the nurse which result to look for.
The same reasoning applies to how a nurse explains prevention to patients. A person newly told they have prediabetes may hear the word as a diagnosis and assume the damage is done, or may hear it as a warning and assume nothing needs to happen yet. Explaining that the lifestyle program is aimed at stopping diabetes from starting, while also improving a measurable abnormality that already exists, gives the person an accurate picture of both the risk and the opportunity. For a person with diabetes, describing the yearly foot examination as a search for early nerve changes, rather than a routine check of an established disease, helps explain why it matters even when the feet feel normal.
Conclusion
Type 2 diabetes shows the three levels of prevention clearly at each stage of its natural history, from community efforts to reduce obesity, through screening for prediabetes, to foot and eye examinations that protect people with established disease. It also shows that the levels blur at the transitions, where a lifestyle program is both primary and secondary prevention and a foot examination is both tertiary and secondary. The resolution is to define the level of prevention in relation to a specific outcome. Done that way, the framework remains one of the most useful tools a nurse has for planning and evaluating health promotion.
References
American Diabetes Association Professional Practice Committee. (2025). 12. Retinopathy, neuropathy, and foot care: Standards of care in diabetes-2025. Diabetes Care, 48(Suppl. 1), S252-S265. https://doi.org/10.2337/dc25-S012
Diabetes Prevention Program Research Group. (2002). Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. New England Journal of Medicine, 346(6), 393-403. https://doi.org/10.1056/NEJMoa012512
Leavell, H. R., & Clark, E. G. (1965). Preventive medicine for the doctor in his community: An epidemiologic approach (3rd ed.). McGraw-Hill.
U.S. Preventive Services Task Force. (2021). Screening for prediabetes and type 2 diabetes: US Preventive Services Task Force recommendation statement. JAMA, 326(8), 736-743. https://doi.org/10.1001/jama.2021.12531
How this NUR 4073 Module 1 example is structured
NUR 4073 Module 1 often separates the three levels of prevention and asks where one stops being the other; your classroom's instructions decide the condition and the format. This example defines the levels from their original framework, then places a named intervention with evidence at each level for one condition, so the definitions are tested against real practice. The two boundary cases get their own section, because the module's question is about edges rather than categories. The conclusion explains why classifying an intervention correctly changes how a nurse evaluates it.
NUR4073 Module 1 questions, answered
What does NUR4073 Module 1 usually ask for?
NUR4073 Module 1 often introduces the three levels of prevention and asks students to define them and apply them to a health condition or population. Many sections ask where one level ends and the next begins. Your classroom's instructions decide the condition, the format and whether examples from your own practice are expected.
Is screening primary or secondary prevention?
Screening is secondary prevention, because it detects disease or a precursor after the process has begun but before symptoms. Screening for a complication in someone who already has a disease, such as a foot examination in diabetes, is secondary prevention relative to that complication even though the underlying disease is established.
How do I handle interventions that fit more than one level?
Name the specific outcome you are trying to prevent, then place the intervention in relation to it. A lifestyle program for prediabetes is primary prevention of diabetes and secondary prevention of the metabolic abnormality already found. Explaining the overlap, rather than forcing one label, usually earns more credit than a simple classification.
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