Avoid trigger allergens Specific immunotherapy for certain allergens Exclude allergy Unnecessary pharmacotherapy Unnecessary avoidance
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4 Allergy diagnosis: Why test? Avoid trigger allergens Specific immunotherapy for certain allergens Exclude allergy Unnecessary pharmacotherapy Unnecessary avoidance
5 Diagnostic tests for allergies
6 : In vivo tests In vitro tests: Skin prick tests Intradermal tests Patch tests Autologous serum skin test Provocation tests Total IgE (RAST tests) (CAST tests) Leukocyte Histamine Release Test Phagocytosis inhibition test ECP. Food challenge test
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8 Indications : Skin Testing Refractory Allergic Rhinitis Refractory Asthma Before initiating immunotherapy Food Allergy Insect allergy or drug allergy Contraindications : Severe Eczematous Dermatitis Dermatographism History of Anaphylaxis Very young (< 2 years) Unable to discontinue Antihistamines Uncontrolled Asthma (Peak expiratory flow < 75%)
9 Preparation Have Epinephrine available Discontinue Antihistamines Second generation Antihistamines: 2 weeks before First generation Antihistamines: 3 days prior to test Other Antihistamine-type agents to stop before test Phenothiazine Tricyclic Antidepressants Anticholinergic Medications H2 Receptor blocking medications (e.g. Ranitidine) Inhaled Corticosteroids do not affect test Short-term Systemic Corticosteroids do not affect test
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12 Test a lot of antigens Use Controls Positive Control: Histamine Negative Control: Glycerol-Saline Read test 15 minutes after application of allergen Positive if wheal diameter 3 mm > negative control
13 Interpretation All Tests negative: No further testing needed One or more inhalants positive: Avoid & Consider Immunotherapy If Positive Control is Negative : If Negative Control is positive : Dermatographism Try RAST testing
14 Skin prick testing Advantages Gold standard for allergy diagnosis Cheap & Quick Visible results. Can be used for allergens where in vitro testing not available Can be done in presence of steroids & cromoglycate Disadvantages Requires trained staff & resuscitation facilities Not possible in severe dermatographism or eczema Some drugs prevent reactions
15 INTRADERMAL SKIN TESTING Intradermal skin testing is practised in some situations. But it is uncomfortable than skin prick. it is more sensitive, is more likely to lead to false positive results. For this reason, it is more commonly used for evaluation of patients with sensitivity to antibiotics or insect venom.
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17 Patch Test Suspected allergens placed on patient s back induce a type IV hypersensitivity reaction via specific T lymphocytes which is read after 72 hours to determine allergic reaction Indications for Patch Test Atypical Eczema & non-immediate skin reactions Allergic Contact Dermatitis Occupational asthma & dermatitis Drug Reactions, especially delayed Non-immediate Food Reactions
18 Autologous serum skin test
19 Side-effects and risks of skin testing Skin tests are slightly uncomfortable, but usually well tolerated. Local itch and swelling normally subsides within 1-2 hours. More prolonged or severe swelling may be treated with an oral antihistamine, topical corticosteroid cream and an ice pack. Occasional patients will experience feel dizzy or light-headed and need to lie down. Severe allergic reactions from allergy testing in asthma are very rare.
20 The bronchial provocation test Bronchial provocation tests (BPTs) are widely used to identify bronchial hyperresponsiveness (BHR). Histamine and methacholine, given by inhalation, are the most commonly used as well as other allergens. Exercise and eucapnic hyperventilation tests are also used, particularly for identifying persons with exercise-induced bronchoconstriction.
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23 Diagnosis of food allergy
24 food challenge test The gold standard for food allergy diagnosis. These challenges take place under close medical supervision. The test is aborted if an adverse reaction occurs at any stage.
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26 In vitro tests: Total IgE (RAST tests) (CAST tests) Leukocyte Histamine Release Test Phagocytosis inhibition test ECP.
27 Total Serum IgE Concentration Levels of total IgE antibody is often (but not always) raised in people with allergies A total IgE level is indicated in the evaluation of asthmatic patients being considered for therapy with monoclonal antibody to IgE. It may be indicated for those patients: internal parasites. allergic bronchopulmonary aspergillosis, immune deficiency disease characterized by increased IgE levels (e.g., Wiskott-Aldrich syndrome, hyper-ige staphylococcal abscess syndrome)
28 Specific IgE : RAST (radio allergo-sorbent test ) These tests detect antigen-specific IgE antibodies in the patient's serum. INDICATION skin testing is not easily available, when skin condition such as severe eczema or dermographism prevent accurate testing in children younger than two years of age. when the patient is taking medications that interfere with accurate testing.
29 RAST tests vs Skin prick tests RAST Quantitative values Not influenced by medication Cross-reactions may occur Fruit allergens labile More expensive False results SPT Results available immediately Cheaper than RAST Difficult to standardise Dependant on technique Results influenced by medication Cannot be performed skin disease on site Small risk of systemic reactions
30 Cellular Allergen Stimulation test (CAST) Cellular test, based on the determination of sulfidoleukotrienes (LTC4, LTD4,LTE4) produced by IL-3 primed basophils stimulated by allergens in vitro The CAST assay has been used in allergy diagnosis, such as inhalation allergies, allergies to insect venoms, foods, occupational allergens and various drugs. the value of this diagnostic test, arises when other diagnostic tests are not reliable, and in non-igemediated hypersensitivity reactions
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32 Mast cell Tryptase The increased levels of tryptase can normally be detected up to three to six hours after the anaphylactic reaction. Levels return to normal within hours after release
33 Leukocyte Histamine Release Test It measures the amount of histamine released in-vitro. An allergen extract is added to the peripheral blood leukocytes of the individual being tested. Histamine is normally released as a consequence of the interaction of allergen with cell-bound IgE antibodies. If an individual is hypersensitive to a specific antigen, the leukocytes will release the histamine in-vitro.
34 PHAGOCYTOSIS INHIBITION TEST This test is not yet approved globally and is still considered investigational testing a substance by addition to the leukocyte -Candida mix instead of histamine, The results are expressed as the percent of cells found having phagocytosed candida In their cytoplasm.
35 Practice Points History + Skin-prick testing remain the "gold standard" for identifying clinically relevant allergens. In vitro tests offer advantages in some clinical situations. A positive RAST in the absence of a consistent history indicates sensitisation, not allergy. Mast cell tryptase is a useful marker of anaphylaxis in situations where the diagnosis is unclear. Elevations of IgE and eosinophilia are non-specific. in the meantime we do not accurately know the extent of non-ige reactions. food challenge test is the "gold standard" for food allergy diagnosis
36 References:
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