The Prevalence Paradox of Allergy
One of the most puzzling faults in medicine is the prevalence paradox of allergy. That paradox gives rise to the damaging misperception that allergy is best left to allergists, leaving the vast majority of allergic patients undetected, undiagnosed and/or untreated. The persistence of the paradox is sustaining needless suffering for millions while simultaneously contributing to the financial hardships primary care practitioners face. The paradox arises from tension among four facts, all of which point back to the need for allergy testing in primary care as a more deliberate part of routine clinical practice:
- Allergy is indisputably one of the most common chronic disease in America
yet - Allergists are a small and shrinking specialty practice,
which shouldn’t matter because - Primary care is the natural home for allergy diagnosis and treatment anyway,
and still, - The vast majority of primary care practices DO NOT test for allergy and even fewer treat it!
The tension here is tectonic, and something has to give. By the numbers alone, allergy testing and treatment should be handled by primary care practitioners predominantly. The obstacles to manifesting this reality are mostly limited to false and often unconscious assumptions, and, sometimes, unpleasant memories of business models that are now obsolete.
Allergy: the most common chronic disease
The CDC has repeatedly published statistics showing that more than 30% of adults have diagnosed allergies. Moreover, that finding is limited to specific kinds of allergies (seasonal, eczema, food). The number is even bigger when undiagnosed allergies, and other symptom sets, are considered. There are dozens of increasingly common symptoms that most people, and perhaps even most medical providers, don’t necessarily associate with allergy. Brain fog, eye bags, or insomnia, for a few examples. Accordingly, The World Allergy Organization advises that the actual prevalence of allergies approaches 50% of patients. Half! The Allergy & Asthma Foundation of America pegs the minimum number at 106 million allergic Americans.
Allergists: the ironically uncommon specialty
In light of the enormous numbers describing the prevalence of allergy, you’d be forgiven for assuming there’s probably at least one allergist in every town with a traffic light. Sadly, no. Allergists aren’t particularly common even in cities. The frustrating reality is there aren’t anywhere near enough allergists to treat over 100,000,000 allergy patients even if those patients had already been identified, tested, diagnosed, and prescribed. Identifying those patients in a general population of more than three times that number is an even larger task, leaving allergists as a specialty even less able to meet the need.
~5K Allergists for >100K Allergic Patients
The Workforce Committee of the American Academy of Asthma Allergy & Immunology (AAAAI, pronounced “quad-Ay eye” by the cool kids) went to great lengths to count practicing allergists and found their number declined from 4,356 in 1999, already too small for 100 million patients, to 4,245 in 2004.i The American Board of Medical Specialties found 5,898 specialists in allergy and immunologyii in 2020, but of those, only about 88% are “core allergists” (the rest focus on autoimmune conditions like Lupus and Type 1 Diabetes), and the US total population had gone up in the intervening decades as well. The National Center for Health Workforce Analysis finds 5,310 allergists & immunologists practicing in 2026. NCHWA’s data reveals the spotty geographic distribution of allergists, as well, with Maryland having more than 60% more allergists than Missouri, despite that those state’s populations are nearly identical
Consider this: in early 2026 the CDC’s published statutorily mandated statistics on the prevalence of diabetes in the United States, and found a prevalence of 12%, compared to over 30% for allergies. That’s people with diabetes compared to well over 100 million people with allergies. And yet, NCHWA counts more than 12,000 endocrinologists for those 40 million people with diabetes, compared to roughly 5,000 allergist for over 100 million people with allergies.
Allergists focus is already diagnosed dangerous allergies, not screening
It is also worth noting that, probably as a result of their disproportionate rarity, allergists generally are not keen to focus their practices on patients who are not already known to face extreme and dangerous allergies. In other words, it’s not often easy for a patient to be seen by an allergist until that patient has already been diagnosed.
And here’s the kicker: one of the often unconscious assumption patients and providers both make is that allergy is usually tested at patient request, or because the patient presents with symptoms in an exam room that the provider identifies with possible allergy. In a proper allergy program that assumption is incorrect. The vast majority of allergy testing occurs as a result of routine screening, in the same way that hypertension is detected. That fact alone makes allergist clinics, as a whole, the wrong place to detect and address the overwhelming majority of allergic patients. Those patients never even walk in the door.
In light of the statistics and practical realities around the prevalence of allergies, it would be folly to consider allergists the destination for routine allergy screening, testing, and treatment. In fact, it makes no sense at all to rely on allergists for diagnosis and treatment of allergy in the general population.
Primary Care is the natural home for addressing nearly all allergy patients, but is not meeting the need
At least most allergy test candidates don’t request allergy testing, and many don’t even know they’re allergic, or at least, what specifically they’re allergic to; they’re by far most often tested as a result of routine screening. Specifically, in a well-run allergy program patients take a symptom survey as a matter of course when giving their medical history upon initial intake into the practice. Then they take that survey again annually because allergies develop over time. If the survey comes up positive, allergy testing is indicated. The timing is different but this screening is otherwise identical in principle to taking blood pressure and weighing each patient on each visit. That practical workflow is exactly why point-of-care allergy testing in primary care fits so naturally inside the clinic itself.
Because nobody goes to a specialist for routine screening, primary care is the front line where allergy testing should be common. But, it’s not happening. Staggering numbers of patients are suffering from allergies, seeing their doctor about other things including annual physicals, and yet never being treated or even tested for allergies. Reliable statistics on the subject are scarce, but best available information suggests perhaps 5 to 10% of primary care clinics offer point-of-care allergy testing. It stands to reason, and is borne out by observations, that even fewer do so as a result of positive results of routine screenings. Rather, most of the few clinics who do offer testing, or refer out for blood testing, do so on patient request or complaint, or because of symptom presentation in exam rooms. The difference between those paths becomes much clearer when you compare in-clinic allergy testing vs lab referral.