Allergy Tests

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What Is Allergy Tests?

Allergy testing identifies allergens, like mold, pet dander, bee stings and peanuts, that can cause allergies. During a skin prick test, a healthcare provider introduces allergens into your skin to check for a wheal (raised mark), rash or other reactions. Blood tests can check for IgE antibodies. The results can help you take steps to manage allergies.

Benefits of Allergy Tests

Find a precise treatment solution

Allergy testing will find the exact allergens that trigger allergic reactions. With this knowledge, it is possible to find a treatment solution that addresses the problem without intruding on all aspects of your life.

Create a manageable diet

Food allergies frequently lead to individuals cutting entire food groups from their diet due to concerns about allergic reactions. But in many cases you won't need to make sweeping changes, and can still get the necessary vitamin and mineral intake.

Help make responsible choices

An allergy test will allow you to avoid choices that could put your health at risk. The knowledge you gain from an allergy test can assist in the decision-making process for you or your child. For example, an allergy to animal dander could influence a decision on getting a pet.

Take control of your environment

Many allergies are seasonal and could only require periodic adjustments. Pollen counts are high during the summer, with grass pollen a major cause of hay fever. However, tree pollen is more common during spring. Allergy tests take much of the confusion out of seasonal allergies.

Prevent severe consequences

Allergy testing can prevent unnecessary risks and reduce the chance of a severe allergic reaction. In some cases, your allergy doctor may recommend carrying an EpiPen at all times.

Determine if your allergy has been outgrown

It is possible that your child will outgrow their allergies. For instance, food allergies to milk and eggs are often outgrown by the adult years. However, allergy testing will be required to know for certain whether a particular substance still poses a risk.

Types of Allergy Tests

Allergy skin testing
This is used to evaluate for suspected environmental or seasonal allergies, food allergy, stinging insect allergy, and certain drug/medication allergies. During skin testing the suspected allergen is placed on the skin and the test results are read after 15 minutes. An allergen is a substance that can cause an allergic reaction. There are 2 methods for skin testing: prick skin testing and intradermal skin testing.
Prick skin testing: Individual solutions containing the suspected allergens are placed on the skin using a prick device. The test results are available 15 minutes later.
Intradermal skin testing: Individual solutions containing the suspected allergens are placed just underneath the surface of the skin using a small needle. The test results are available 15 minutes later.

Blood tests
some patients may require blood tests called specific IgE tests (also commonly known as RAST) to complete their allergy evaluation. Specific IgE tests can also be obtained in some situations where allergy skin testing is not appropriate. Such situations would include:
(a)when a patient cannot discontinue antihistamines or certain other medications that would affect skin test results
(b)patients with a condition called dermatographism (whereby scratching the skin causes hives)
(c) patients with skin rashes/lesions that prevent us from accurately reading the skin test results.

Spirometry (lung function tests)
This is a type of lung function test that we use to specifically evaluate for asthma. Asthma often occurs in individuals who have allergies. Individuals who report symptoms or have exam findings that are suspicious for asthma will require spirometry.

Patch testing
This is used to evaluate for an underlying trigger/agent in individuals who develop contact dermatitis. Examples of contact dermatitis is the development of a rash after wearing certain metal jewelry or using a certain skin care product. The suspected agents are placed in the form of patches on the back. The patches are removed 48 hours later. The results are read 2 to 5 days after the patches are removed, and sometimes up to 10 days after removal. You should avoid water and moisture in areas where the patches are placed unless there is a special moisture-proof cover placed over the patches.

How to Treat Allergy Symptoms

If testing confirms you have an allergy, you can work with your doctor or allergist to develop a treatment plan. These plans focus on methods to manage your symptoms and reduce your risk for more serious reactions.
Common allergy treatments include:
Avoiding your trigger. Minimizing your exposure to triggers is an effective way to manage allergy symptoms.
Antihistamines. These medications help block the effects of histamine, a chemical released during an allergic reaction.
Allergy shots (immunotherapy). Regular allergy shots may help reduce your sensitivity to allergens.
EpiPen (epinephrine) injections. This emergency medication treats serious allergic reactions. People at risk for anaphylaxis should always carry an EpiPen with them.
Other medications like decongestants and corticosteroids may help reduce congestion and inflammation to provide more relief from allergy symptoms.
Allergies can be a burden, but testing and treatment can help manage your symptoms. Talk to your doctor about allergy testing and the best way to treat your allergies.

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FAQ

Q: What tests are done to check for allergies?

A:Skin tests for allergic disorders have been used successfully for more than 100 years. Today, prick or scratch tests are the most commonly-used type of skin test. These tests are not very invasive and, for most allergens, they tend to produce quick results.

Q: What is the most accurate allergy test?

A: Skin prick testing (SPT) is the preferred testing method for true food allergy. It is safe for most patients—even infants—and it can be done during a regular clinic visit. Results are available immediately after the test, so you will be able to discuss the results with your allergist at the same visit.

Q: What does a full allergy test consist of?

A: Placing a small amount of substances (allergens) that may be causing your symptoms on the skin, most often on the forearm, upper arm, or back. The skin is then pricked so the allergen goes under the skin's surface. The health care provider closely watches the skin for swelling and redness or other signs of a reaction.

Q: What are the risks of allergy testing?

A: You may be so sensitive to certain substances that even the tiny amounts used in skin tests could trigger a life-threatening reaction (anaphylaxis). Take medications that could interfere with test results. These include antihistamines, many antidepressants and some heartburn medications.

Q: Can a blood test detect any allergies?

A: An allergy blood test checks your blood for increased levels of immunoglobulin E (IgE) antibodies. The test can help detect allergies to foods, pets, pollen or other irritating substances. Allergy blood tests can deliver false positive results more than half of the time.

Q: How accurate are allergy blood tests?

A: About 50-60 percent of all blood tests and skin prick tests will yield a “false positive” result. This means that the test shows positive even though you are not really allergic to the food being tested. These results occur for two reasons: The test may be measuring your response to the undigested food proteins.

Q: Are allergy skin tests worth it?

A: Despite the high rate of false positives, in the hands of an experienced allergist, skin and blood tests are extremely helpful.

Q: Are online allergy tests worth it?

A: Adam's advice, then, is that home testing for allergies is not useful – medical expertise is needed to determine exactly what test is best in your particular circumstances, and then to interpret it with your symptoms in mind.

Q: Is an allergy blood test more accurate than a skin test?

A: Generally speaking, skin tests are more sensitive than blood tests, meaning they are more likely to detect allergies that a blood test may miss. Skin tests also require less wait time, as results are typically delivered in 15-20 minutes, rather than the one to two week wait time of blood tests.

Q: What should you avoid before allergy testing?

A: Do not take over the counter antihistamines (Benadryl, cold & sinus medications, sleep aids such as Tylenol PM) 7 days before the test. Do not take medications such as Tagamet, Pepcid, or Zantac 1 day prior to testing, as these contain a form of antihistamine. Do not take a tricyclic antidepressant medication.

Q: How long does it take for allergy test results?

A: Skin prick tests are conducted in a doctor's office and provide results within 15-30 minutes. A nurse or the allergist administers these tests on the patient's arm or back by pricking the skin with a small, sterile probe that contains a tiny amount of the food allergen.

Q: What not to eat before allergy test?

A: Avoiding certain foods and drinks before an allergy test can help ensure accurate results. For example, certain fruits and vegetables with high cross-reactivity with allergens, such as apples, cherries, melons, cucumbers, and bananas, can result in false-positive allergy test results.

Q: Are allergy shots worth the risk?

A: Allergy shots may be right for you if other medications don't help control your allergy symptoms and you want long-term allergy relief. While allergy shots are effective, they have some serious downsides and have a risk of causing severe allergic reactions.

Q: Is it normal to feel sick after allergy testing?

A: Skin testing is generally well tolerated. The most common reaction is local itching and swelling of the test site which resolves within a few hours. Other possible side-effects include itching of the eyes, nose, throat; runny nose, wheezing, light-headedness, hives and nausea.

Q: What if I test negative for allergies but still have symptoms?

A: If you tested negative to all 45 allergens, then you likely have either a sensitivity to a less common allergen or you have nonallergic rhinitis, which just seems like an allergy. At any rate, you certainly can get on with treatment. A combination of nasal sprays, antihistamines and eye drops (if needed) should help.

Q: What does W and F mean on an allergy test?

A: The test is positive if there is a wheal and flare response described above. A positive test raises the possibility of a true allergy but is not diagnostic or confirmatory for having a true allergy. If there is no reaction with a wheal and flare, the test is read as negative and being allergic is very unlikely.

Q: How many pricks are in an allergy test?

A: Your doctor may test you for as few as three or four substances or as many as 40. The test is usually performed on the inside of your arm or on your back. Typically, a nurse administers the test, and then your doctor reviews your reactions.

Q: When should you get allergy tested?

A: You should see an allergist if: Your allergies are causing symptoms such as chronic sinus infections, nasal congestion or difficulty breathing. You experience hay fever or other allergy symptoms several months out of the year.

Q: Does Medicare cover allergy blood test?

A: Medicare Part B may cover allergy testing if you meet all the below criteria: Your physician must prescribe the allergy test. Your physician must be enrolled in Medicare and accept assignment. The test must be considered medically necessary, and your physician must provide documentation that says so.

Q: Do home allergy test kits work?

A: While seeing a huge list of allergens listed on the box of a home test kit may seem appealing, the results are questionable at best. Due to the nature of these tests and the lack of expert interpretation, there is a high potential for your specific reactions to be misdiagnosed.

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