Frequent sneezing, congestion, itchy eyes, and postnasal drip may be associated with allergies. These symptoms can affect sleep, concentration, and daily comfort, but allergies are only one possible cause.
For people living in Bethesda, Chevy Chase, and the surrounding Washington metropolitan area, understanding allergy testing may help clarify how healthcare professionals evaluate potential triggers. This page explains common testing methods, their limitations, and how results may inform care.
Allergy testing helps healthcare professionals assess whether the immune system reacts to specific substances, such as pollen, mold, dust mites, or pet dander.
Testing may involve skin tests or blood tests. Results are interpreted alongside symptoms, medical history, and exposure patterns; a positive result alone does not necessarily mean that a substance is causing symptoms.
Allergies occur when the immune system reacts to a substance that is usually harmless to other people. These substances are called allergens.
Environmental allergens commonly associated with nasal and eye symptoms include:
Allergies can also involve foods, medications, or insect venom, although evaluating these reactions may require different testing approaches.
Seasonal pollen and indoor allergens may contribute to symptoms among Washington metropolitan area residents. Symptoms that occur year-round may have different triggers from those that appear only during certain seasons.
A healthcare professional may consider an allergy evaluation when symptoms are persistent, recur with particular exposures, or remain difficult to manage.
Symptoms may include:
Testing is not necessary for every person with these symptoms. A clinician can determine whether testing is appropriate and select allergens based on the person’s history rather than using an unrelated, broad testing panel.
Allergies and sinus conditions can share symptoms, including congestion, drainage, and facial pressure. Sneezing and itchy eyes are commonly associated with allergies.
Symptoms alone may not establish the cause. Allergies, infections, and other nasal conditions can overlap, so persistent or worsening symptoms may require clinical evaluation.
Allergies can cause nasal inflammation and swelling, which may contribute to congestion and interfere with normal sinus drainage. However, allergies are not the cause of every sinus problem, and allergy testing does not diagnose a sinus infection.
During skin prick testing, small amounts of selected allergens are placed on the skin, usually on the forearm or back. The skin is lightly pricked, and a healthcare professional checks for localized reactions.
Results are commonly assessed within about 15 to 20 minutes. Skin prick testing is frequently used to evaluate suspected environmental allergies.
Intradermal testing involves injecting a small amount of allergen just beneath the skin. It may be used in selected situations, including evaluations for certain medication or insect venom allergies.
This method is not appropriate for every suspected allergy and is not used to diagnose food allergies.
Blood testing measures antibodies called allergen-specific immunoglobulin E, or IgE, directed against selected allergens.
It may be considered when skin testing is unsuitable, such as when a skin condition or certain medications could interfere with testing. Blood test results generally take longer to become available than immediate skin test results.
The healthcare professional performing the evaluation reviews symptoms, medical history, medications, and suspected exposures.
Certain medications, including antihistamines, can interfere with skin testing. Medication changes should be made only according to instructions from the testing clinician. Preparation requirements differ by test type.
Skin testing may cause temporary itching, redness, or small raised bumps. Blood testing involves a needle stick and may cause brief discomfort or bruising.
Serious allergic reactions to skin testing are rare, but possible. Testing takes place in a medical setting equipped to recognize and manage reactions.
The clinician reviews the findings in the context of the person’s symptoms and exposure history. A positive result may indicate sensitization—an immune response to a substance—without proving that it causes symptoms during everyday exposure.
Results may help inform exposure reduction, medication choices, or consideration of other management options. Testing does not guarantee symptom improvement or identify every possible cause of congestion.
Depending on the diagnosis and individual circumstances, management may include:
Immunotherapy may involve allergy shots or FDA-approved sublingual tablets for specific allergens. Customized liquid allergy drops are not FDA-approved for sublingual allergy treatment in the United States and are used off-label. These options differ in suitability, risks, and coverage.
Not necessarily. A positive result must be considered alongside symptoms, exposure patterns, and medical history. Some people have positive results without symptoms when exposed to that substance.
It may help determine whether allergies contribute. Congestion can also have other causes, so allergy testing may be only one part of an evaluation.
Skin prick testing usually causes mild discomfort, although itching may occur. Intradermal and blood tests involve needles. Individual experiences vary.
Coverage depends on the insurance plan, medical necessity, testing method, and provider network. Patients can confirm benefits and potential costs with their insurer and the clinician performing the testing.
Persistent nasal or allergy-like symptoms can have several causes. A qualified healthcare professional can review symptoms, determine whether allergy testing is appropriate, and explain what the results mean.
For additional information, visit the American Academy of Allergy, Asthma and Immunology’s allergy testing guide.
This page provides general educational information about allergy testing and does not describe services available at Bethesda ENT and Sinus Center. It is not a substitute for individualized medical advice.
Severe breathing difficulty, throat swelling, or signs of a serious allergic reaction require immediate emergency attention.
Individual results may vary. Information on this website is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. In the event of a medical emergency, call 911.