Allergy Testing in the Capital Region

Allergy testing is used to determine whether the immune system reacts to specific substances called allergens.

These allergens may include pollen, dust mites, mold, pet dander, foods, insect venom, or certain medications.

When a person with allergies encounters an allergen, the immune system releases antibodies and inflammatory chemicals that cause symptoms such as itching, swelling, or respiratory irritation. Testing helps identify the specific allergens responsible for these reactions.

Allergy testing is often recommended for patients who experience:

• Persistent nasal congestion or sneezing
• Chronic sinus symptoms
• Itchy or watery eyes
• Skin rashes or hives
• Asthma symptoms triggered by environmental exposures
• Suspected food or medication allergies

Identifying the underlying allergens allows allergists to recommend targeted treatments and prevention strategies.

Several types of tests may be used to diagnose allergies depending on the patient’s symptoms and medical history.

Skin Prick Testing

The skin prick test is the most commonly used method to evaluate environmental allergies. During this test, small amounts of suspected allergens are placed on the skin—usually on the forearm or upper back—and a small prick allows the allergen to enter the outer layer of skin.

If the patient is allergic to a substance, a small raised bump similar to a mosquito bite typically appears within about 15–20 minutes.

Skin prick testing is commonly used to evaluate allergies to:

• Tree, grass, and weed pollens
• Dust mites
• Mold
• Pet dander
• Certain foods
• Insect venom

Because results are available quickly, allergists can often review findings and discuss treatment options during the same visit.

Intradermal Skin Testing

In some cases, a patient may have symptoms consistent with allergies but show negative results on initial skin prick testing. When this occurs, the allergist may recommend intradermal skin testing for certain allergens.

During intradermal testing, a small amount of allergen is injected just beneath the surface of the skin using a very small needle. This method introduces the allergen slightly deeper into the skin than a prick test and can detect sensitivities that may not appear during standard skin testing.

Intradermal testing is most commonly used for inhalant allergens, including:

• Environmental pollens
• Dust mites
• Mold
• Pet dander
• Penicillin
• Insect venom

This test is not typically used for food allergy testing because of the increased likelihood of false-positive results with foods.

Intradermal testing is performed under medical supervision and results are evaluated after a short observation period. When appropriate, this testing may provide additional diagnostic information that helps the allergist develop a more precise treatment plan.

Blood Tests for Allergies

In some situations, your allergist may recommend blood testing to evaluate allergies. These tests measure the presence of allergen-specific antibodies in the bloodstream.

Rather than drawing blood in the office, Certified Allergy & Asthma Consultants orders allergy blood tests through the patient’s preferred laboratory. A small blood sample is collected at the laboratory and analyzed to identify potential allergy sensitivities.

Blood testing may be recommended when:

• Skin testing cannot be performed
• A patient has certain skin conditions that interfere with testing
• Allergy medications cannot be stopped before testing
• Additional information is needed to clarify initial skin test results

Results are reviewed by your allergist and used to help guide diagnosis and treatment recommendations.

Patch Testing

Patch testing is used to identify delayed allergic reactions, particularly those affecting the skin such as contact dermatitis.

During this test, small patches containing potential allergens are applied to the skin and left in place for a period of time to observe delayed reactions.

Patch testing may help identify allergies to substances such as:

• Metals (such as nickel)
• Fragrances or preservatives
• Certain chemicals found in cosmetics or personal care products
• Rubber or latex chemicals
• Topical medications
• Ingredients in soaps, shampoos, or hair dyes
• Sunscreens

Before allergy testing, your allergist will review your medical history and discuss your symptoms and possible triggers. This evaluation helps determine which tests are most appropriate.

Depending on the type of testing performed, your visit may include:

• A physical examination
• Skin testing for common allergens
• Blood testing when necessary
• Discussion of results and recommended treatment options

Skin testing results are usually available within minutes, while blood test results may take a week or more.

To ensure accurate results, your allergist may recommend certain preparation steps prior to testing.

These may include:

• Stopping antihistamines several days before testing. Click here to view a list of medications to be stopped.

• Avoiding certain allergy medications
• Informing your physician about all medications you are currently taking

Your care team will provide specific instructions before your appointment.

Identifying allergy triggers provides important information that helps guide treatment decisions.

Benefits of allergy testing include:

• Identifying the exact allergens causing symptoms
• Creating targeted treatment plans
• Helping patients avoid specific triggers
• Determining whether immunotherapy may be beneficial

Testing is an important step toward improving long-term allergy management and symptom control.