Seeing an allergist usually starts with a referral from your primary care doctor, though some insurance plans let you book directly. The process is straightforward once you know what to expect: get the referral if needed, prepare for your visit by adjusting medications, and show up ready to describe your symptoms in detail. Here’s how each step works.
Getting a Referral vs. Booking Directly
Most HMO and many PPO insurance plans require a referral from your primary care physician before they’ll cover an allergist visit. Call the member services number on the back of your insurance card and ask two things: whether you need a referral for a specialist visit, and whether the allergist you’re considering is in-network. If your plan requires a referral, your primary care doctor can usually submit one within a few days.
If you have a PPO or EPO plan that allows self-referral, you can call an allergist’s office directly and schedule. Even without a referral requirement, some allergist offices still prefer that your primary care doctor sends over your medical records beforehand, so it’s worth asking when you call to book.
What Allergists Actually Treat
Allergists handle far more than seasonal sneezing. They’re trained to diagnose and manage hay fever, food allergies, drug allergies, insect sting allergies, latex allergies, asthma, eczema, chronic hives, anaphylaxis, sinus infections, and a category of genetic conditions called primary immunodeficiency disorders that prevent the immune system from working properly. If you’re dealing with any of these, an allergist is the right specialist.
This breadth matters because many people wait years before seeing one, assuming their symptoms are “just allergies” that don’t warrant a specialist. Chronic hives that last more than six weeks, recurring sinus infections, or asthma that isn’t responding well to your current inhaler are all solid reasons to go.
How to Verify an Allergist’s Credentials
A qualified allergist in the United States completes a full residency in internal medicine, pediatrics, or both, then finishes an additional two years of fellowship training specifically in allergy and immunology. Board certification comes from the American Board of Allergy and Immunology, which is jointly overseen by the boards of internal medicine and pediatrics. You can verify a doctor’s board certification on the ABAI website.
Because fellowship training covers both children and adults, most allergists see patients of all ages. You don’t necessarily need a “pediatric allergist” for your child, though some allergists do focus their practice on kids.
Preparing for Your First Appointment
The single most important thing to do before your visit is stop taking antihistamines. Skin testing, the most common diagnostic tool allergists use, won’t work if antihistamines are suppressing your immune response. The timeline depends on the type of medication:
- Oral antihistamines (like cetirizine, loratadine, or diphenhydramine): stop 5 days before testing
- Antihistamine nasal sprays: stop 3 days before testing
- Other relevant medications: stop 2 days before testing
When you schedule your appointment, the office should tell you exactly which medications to pause. Don’t stop any medication without confirming with them first, especially if you take something for asthma or another chronic condition.
What to Bring
Allergists diagnose faster and more accurately when you arrive with specific information rather than vague descriptions. Start keeping a symptom diary in the weeks before your appointment. Write down when your symptoms happen, what you were doing or eating, where you were, and how severe the reaction was on a simple scale. Note any patterns: worse in the morning, worse outdoors, worse after certain meals.
Also bring a complete list of every medication and supplement you currently take, your insurance card, any relevant medical records or prior test results, and a written list of questions. If you’ve had a serious allergic reaction in the past, write down exactly what happened, what you think triggered it, and how it was treated.
What Happens During the Visit
Your first appointment typically runs 45 minutes to an hour. The allergist will review your medical history, ask detailed questions about your symptoms, and then decide which type of testing makes sense.
Skin prick testing is the most common approach. The allergist or a nurse applies tiny amounts of potential allergens to your forearm or back using either small needle pricks or droplets pressed into the skin with a scratching device. You’ll then wait about 15 to 20 minutes. If you’re allergic to a substance, a small raised bump (similar to a mosquito bite) appears at that spot. The test checks for airborne allergies, food allergies, and penicillin allergies. It’s mildly uncomfortable but not painful for most people.
Blood testing is the alternative. A blood sample is sent to a lab, which measures levels of an antibody your immune system produces in response to specific allergens. Results take a few days to come back. Blood tests are useful when skin testing isn’t practical, for instance if you can’t stop taking antihistamines, have severe eczema covering large areas of skin, or have a history of extreme allergic reactions. One trade-off: blood tests have a slightly higher rate of false positives, meaning they sometimes flag an allergy that isn’t really there. They can also be slightly less accurate in children under 5. On the other hand, false negatives (missing a real allergy) are rare with either method.
After Testing: What Comes Next
If your allergist identifies specific triggers, the next step is a management plan tailored to your results. This might include avoidance strategies (practical changes to reduce your exposure), prescription medications that work better than over-the-counter options, or allergy immunotherapy. Immunotherapy involves regular exposure to tiny, gradually increasing doses of your allergen to retrain your immune system over time. It’s available as injections (allergy shots, typically weekly or biweekly at first) or sublingual tablets that dissolve under your tongue at home.
For food allergies, the allergist may recommend an oral food challenge, where you eat small amounts of the suspected food under medical supervision to confirm whether you truly react. This is especially useful when blood or skin test results are ambiguous.
Follow-up visits are usually scheduled every few weeks to months depending on your treatment plan. If you’re getting allergy shots, expect to visit the office frequently during the initial buildup phase, then less often once you reach a maintenance dose.
Insurance and Cost Considerations
An initial allergist consultation is billed as an evaluation and management visit, similar to seeing any other specialist. Skin prick testing is billed per individual test, and it’s common to be tested for 20 to 40 allergens in a single session. Before your appointment, call your insurance company and confirm that both the office visit and allergy testing codes are covered under your plan. Ask specifically about cost-sharing: what your copay is for a specialist visit, whether testing requires separate authorization, and whether there’s a cap on the number of tests covered per session.
If you’re uninsured or underinsured, ask the allergist’s office about self-pay rates upfront. Some offices offer bundled pricing for a consultation plus a standard panel of skin tests, which can be significantly cheaper than the itemized rate.