If you have ever left a doctor's appointment feeling that the most important question never came up, there is a reasonable explanation, and it has little to do with whether your doctor cares. It is arithmetic.
The numbers
In 2003, researchers at Duke published a now famous paper in the American Journal of Public Health2 asking a simple question. If a primary care physician tried to deliver every preventive service recommended by the US Preventive Services Task Force to a typical panel of 2,500 patients, how long would it take? Their estimate was 7.4 hours per working day, for prevention alone. A companion study in the Annals of Family Medicine3 estimated that managing common chronic diseases to guideline standards would take more than 10 hours a day on top of that.
Twenty years later, a team led by researchers at the University of Chicago updated the math with 2020 guidelines and data from a nationally representative survey. Their 2022 simulation in the Journal of General Internal Medicine1 found that a primary care physician would need 26.7 hours per day to provide recommended care. That included 14.1 hours for preventive care, 7.2 hours for chronic disease care, 2.2 hours for acute problems and 3.2 hours for documentation and inbox work.
There are only 24 hours in a day. Something has to give, and what usually gives is prevention.
There are only 24 hours in a day. Something has to give, and what usually gives is prevention.
View the data
| Task | Physician alone | Team-based care |
|---|---|---|
| Preventive | 14.1 | 2.0 |
| Chronic disease | 7.2 | 3.6 |
| Acute care | 2.2 | 1.1 |
| Documentation and inbox | 3.2 | 2.6 |
| Total | 26.7 | 9.3 |
Source: Porter et al., Journal of General Internal Medicine, 2023
Why prevention loses
Acute problems announce themselves. A patient with a fever, a sprained ankle or chest pain will be seen. Chronic conditions like diabetes and high blood pressure have numbers that need adjusting and medications that need refilling. Prevention, by contrast, is quiet. A colon cancer screening that is a year overdue does not hurt. An Lp(a) test that was never ordered produces no symptoms. A conversation about strength or sleep can always wait until next time.
Over years, those deferrals add up. They are part of why so many adults have unrecognized prediabetes and why so few are metabolically healthy.
The models trying to fix it
The same 2022 study tested a different structure. When nurses, medical assistants, pharmacists and health coaches took on tasks within their training, the physician's required time dropped from 26.7 hours to 9.3 hours a day. That is still a long day, but it is within reach.
Another response has been to shrink the panel. Concierge medicine and direct primary care practices typically care for a few hundred patients per physician rather than a few thousand, funded by an annual or monthly membership fee. The tradeoff is explicit. Patients pay more out of pocket and in return get longer visits, more direct access and more time spent on prevention and planning. For people who want an ongoing relationship focused on aging well, that time is the product.
It is fair to name the limits. Membership models are not affordable for everyone, and critics worry they can pull physicians away from the broader system at a time of primary care shortages. Many practices respond by keeping fees transparent and coordinating closely with specialists and insurance-based care. Whatever the model, the underlying lesson from the research applies everywhere. Good preventive care requires time, and time has to come from somewhere.
Getting more out of any visit
Whether you see a concierge physician or a busy community practice, a few habits help.
Bring a short written list and lead with your most important concern rather than mentioning it as you stand up to leave. Clinicians call that the doorknob question, and it rarely gets the attention it deserves.
Ask directly about preventive care that is due. Questions such as "Am I up to date on cancer screening?" or "Have I ever had my Lp(a) checked?" take seconds and put prevention on the agenda.
Use the patient portal for refills and simple follow-ups, which frees visit time for conversation.
Track your own numbers between appointments. Home blood pressure readings, a running list of medications and supplements, and notes on symptoms make each visit more efficient.
Ask about team members. A nurse, health coach or pharmacist may be the right person for a detailed conversation about nutrition, medication side effects or exercise.
The research does not say that primary care is failing. It says the job, as currently defined, does not fit in a day. Patients who understand that can work with their clinicians to make sure the quiet, preventive work gets done anyway.
