Allergies Diagnosis

Allergies Diagnosis

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    A Allergy & Immunology, answered on behalf of
    The three main causes of allergy symptoms are allergic rhinitis, irritant rhinitis or a combination of both (called mixed rhinitis). Allergic rhinitis is caused by a component of your immune system called the immunoglobin E (IgE) antibody. The cause of nonallergic rhinitis or irritant rhinitis s is a direct irritation of your nose. There is no way to tell them apart by just asking questions, not even for an allergist.

    Allergy testing (either skin test or blood test) determines which of these is the underlying cause of your allergy symptoms. Allergic rhinitis is an immune system response that has positive allergy tests (either scratch test or blood test). Irritant rhinitis is a nonimmune response that has negative (normal) allergy tests.

    It's important to know what causes your symptoms, because the right  diagnosis will lead to the right treatment.
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    A , Allergy & Immunology, answered
    The delayed hypersensitivity (TB or candida skin tests) test is a descendant of the old tine test, and utilizes either the familiar PPD tuberculin, or candida, mumps, or other substances that most people have been exposed to at one time in their lives. The process involves injecting a few drops under the skin, usually on the forearm. The physician observes the site in 72 hours for a reaction. In a normally functioning immune system, the candida or mumps sites should show a raised, red area. This test is also qualitative as it determines the function of the T cell or cell-mediated system.
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    A , Allergy & Immunology, answered
    Science shows us that skin tests and blood tests for allergies don't really measure the same things. The antibodies that register in a blood test have a half-life of two days. They come and go without putting your immune system on a state of red alert. The ones that react in the skin have a half-life of six to eight weeks, which means that your body is ready to strike for a protracted period.
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    Your allergist may perform a skin prick test to discover what you are allergic to. The allergist will have solutions of common allergens. During the test, a small drop of each allergen solution is placed on your arm. Then your skin is pricked in order to expose your system to the allergen. Your arm will swell slightly at the pinprick point if you are allergic to that allergen.

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    A , Internal Medicine, answered

    If you already know what is causing your rash, say a new soap or the ring you bought on the street that contains nickel, you can do things to avoid it so your rash doesn’t come back. But for those who have no idea what’s causing their reaction, an allergist can perform a patch test to (hopefully) isolate the pesky allergen that is causing your discomfort. There are two techniques:

    1) A drop of a liquid containing the suspected allergen is dropped onto the skin (usually on your arm or back, depends on how many you’re testing). Your doc will then prick the area. If the skin turns red and blotchy, that indicates the possible presence of an allergy. Possible is key here; skin tests do yield many false positives.

    2) A small amount of the potential allergen is injected under the skin. If a lump appears at the site of the injection, you are judged to have tested positive. The bigger the lump, the stronger the liability.

    And don’t worry, these unpleasant red bumps aren’t permanent. They’ll heal and disappear about a week after the test. There is a controversy over how valid this type of testing is.
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    A , Allergy & Immunology, answered
    Allergy tests can be misleading if administered by inexperienced practitioners. For example, an inexperienced doctor might order a broad panel of tests and interpret any level of reaction as allergies. This is a big problem when testing for food. Many children and adults for that matter might forego foods to which they aren't allergic, making it hard to eat a healthy diet. A good allergist will look at test results in conjunction with a good clinical history and be able to rule foods in or out of the diet.
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    A answered

    A RAST (radioallergosorbent) blood test looks for specific immunoglobulin E (IgE) antibodies in your blood. If the antibodies are present, it most likely indicates a true allergic reaction. RAST is the safest type of allergy test, but compared with a skin prick test, it takes longer to produce results and it can't test for as many allergens at once.

    This type of allergy test is typically used only in special circumstances where skin testing is not advised -- for example, if a person has a severe skin condition or is taking certain medications.

  • 3 Answers
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    A , Nutrition & Dietetics, answered

    I'd like to expand on what Jim White replied...It's important to determine if you have what is called "allergy" which is a Type 1 hypersensitivity reaction. It is IgE mediated and is immediate. These are not always life threatening but they could be. Think of things like peanuts, shellfish, etc. 

    Then, there are delayed reactions, which are called food sensitivities. They still involve the immune system, but they are not IgE mediated. They are Type 3 and/or Type 4 hypersensitivity reactions. Because they are delayed, dose dependent (not causing a reaction every single time) and person specific, they are hard to isolate. "Allergy" tests will not pick up a type 3 or type 4 reaction. Alcat and LEAP MRT both will - of the two, MRT has better technology at this point since it can quantify reactions. IgG tests cannot identify chemical triggers, and IgG has been shown to be protective as well as pathogenic. 

    Working with a dietitian experienced in this area is paramount. Food triggers can be hidden, and it will work best if the patient can avoid any and all reactive foods for 4-5 weeks while the immune system calms down. Education is needed to do meal planning, grocery shopping, label reading, what to do if a reaction occurs, etc. 

    There are many MRT therapist available, myself included. A doctor is needed to order the test if you wish to use insurance. For those without insurance or with poor insurance, a cash price is available and no doctor is required. Just a blood draw and a good attitude:)

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    A , Pediatrics, answered
    How are seasonal allergies diagnosed?
    Seasonal allergies are usually diagnosed because kids start showing symptoms every year around the same time. In this video, I will explain these symptoms.
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  • 6 Answers
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    Allergies are diagnosed through allergy testing. You can expect the following if you go for allergy testing. Often, the results are available the same day.
    • Clinical evaluation -- a thorough evaluation is important, including complete medical and family history, as allergies tend to have a genetic component
    • Allergy testing -- this is done through skin testing in the office. A small amount of several allergens are tested on the patient's skin. Results are available 20 minutes after the test is placed. Individuals who are not candidates for skin testing can have blood tests for allergies.
    • Endoscope -- your doctor will carefully examine the inside of your nose to assess other possible conditions such as nasal polyps and sinusitis
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