Laboratory Diagnosis of Allergy INSIDE THIS ISSUE: Dr David Heyworth-Smith ISSUE 2, 2017
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1 INSIDE THIS ISSUE: > Laboratory Diagnosis of Allergy > Faecal Calprotectin: A Biomarker of Bowel Inflammation > Blood Tests in Investigation of Coeliac Disease ISSUE 2, 2017 Laboratory Diagnosis of Allergy Dr David Heyworth-Smith Allergic disorders are increasingly prominent in Australia and globally. This reflects both a true increase in the burden of allergic disease, especially that of childhood food allergy in the last 2 decades, and also increased awareness of allergy amongst health care and community members. Correspondingly, advances in allergy diagnosis and management have occurred over this period. The management of allergic disorders requires accurate diagnosis of the offending triggers or allergens provoking the condition. Tasmanian Medical laboratories provides tests for allergy diagnosis including In vitro Specific IgE (RAST) detection, and specific IgE for native and recombinant component allergens. Our methodology utilises world leading technology including Phadia ImmunoCAP and ISAC systems. The detection of specific IgE is integral to the assessment and management of allergic disorders including those of: Allergic rhino conjunctivitis Atopic eczema Asthma Food allergy Stinging insect allergy Certain drug allergies Certain occupational allergies >>> CONTINUED OVERLEAF If you would prefer to receive the newsletter electronically, please enquiries@tmlpath.com.au
2 FEATURE ARTICLE ALLERGEN-SPECIFIC IGE An allergen-specific IgE test is used to measure the amount of IgE antibody in the serum that is specific to a particular allergen. In clinical practice, 0.35 ku/l has commonly been used as a cut-off for allergen-specific IgE to separate positive from negative results. Measurement of low levels of IgE (between 0.10 and 0.50 ku/l) have recently been shown to be important in some patients for particular allergens and Tasmanian Medical Laboratories now reports these results down to a concentration of 0.10kU/L. These are most relevant for some drug and venom allergens. Specific IgE results of <0.10 ku/l on the Phadia ImmunoCAP platform indicate low probability of clinical allergy to a specific allergen, whereas high antibody levels to an allergen show good correlation with clinical allergy to a specific allergen. Significance may also be affected by total IgE levels, which is a useful additional test to assist with interpretation. Very elevated levels of total IgE (e.g. > 5000 ku/l) may lead to low level false positive specific IgE results. Table a: Interpretive table for allergen-specific IgE Allergen-specific IgE result (kua/l) IgE Ab Level Symptom relation < 0.1 undetectable unlikely very low uncommon low possible 2-15 moderate common high high > 50 very high very high NOTE: Asymptomatic allergen sensitisation is not an indication for allergen avoidance. Avoidance should be recommended only when clinical symptoms of reactivity to allergen exposure develop. SELECTION OF ALLERGENS FOR TESTING FOR SPECIFIC IGE DIAGNOSIS Allergen selection is directed by the clinical scenario of the patient. The most common inhalant allergen sensitivities are house dust mite, grass pollens, mould spores and animal danders. The most common food allergen sensitivities are egg, nuts and seeds, seafood, cow s milk and wheat. A guide to requesting tests for allergy based on the clinical presentation follows. Serum will be held for up to 12 months to allow for additional add-on testing. SUGGESTIONS BASED ON CLINICAL PRESENTATION 1. Infant-12 months: In this age group food allergens predominate with usually little sensitisation to inhalant allergens. Milk Egg Fish Wheat Nuts Cereals Suspected allergens can be requested individually or request food mix (milk, egg, soy, peanut, fish (cod), wheat) if triggers are unclear Nut mix (peanut, almond, coconut, hazelnut, brazil) Cereal mix (wheat, oats, buckwheat, corn, sesame) Request the above tests OR Extended RAST panel Allergenic Foods 20
3 FEATURE ARTICLE 2. Early childhood: 1-5 years: In this age group both food and inhalant allergy occurs. Test choice should be determined by the clinical picture. Milk Egg Fish House dust mite Grass pollens Animal allergens Suspected allergens can be requested individually or request food mix (milk, egg, soy, peanut, fish (cod), wheat) if triggers are unclear House dust mite (D. pteronyssinus) Grass pollen mix (couch, timothy, johnson, rye, paspalum, meadow) Animal mix (cat, dog, horse, cow) Request the above tests OR Extended RAST panel(s) Childhood allergy 15, Inhalant allergy Older children and adults: In this age group environmental (inhalant) allergy predominates with lesser frequency of food allergy. Test choice should be determined by the clinical picture. Environmental (inhalant) allergy House dust mite Grass pollens Danders Moulds House dust mite (D. pteronyssinus) Grass pollen mix (couch, timothy, johnson, rye, paspalum, meadow) Animal mix (cat, dog, horse, cow) Mould mix (penicillium, cladosporium, alternaria, aspergillus) Request the above tests OR Extended RAST panels Inhalant allergy 10, Moulds and Mites 10 Nut allergy Nuts Sesame Cashew, walnut, macadamia + nut mix (peanut, almond, coconut, hazelnut, brazil) Sesame Request the above tests OR Extended RAST panels Childhood allergy 15, Allergenic foods 20 Seafood allergy Fish Crustaceans Molluscs Uncertain seafood Cod, salmon, tuna, hake Shrimp, crab, lobster Oyster, mussel, squid, scallop Crab, squid, lobster + seafood mix (cod, shrimp, tuna, blue mussel, salmon) >>> CONTINUED OVERLEAF
4 FEATURE ARTICLE EXTENDED SPECIFIC IGE (EXTENDED RAST) PANELS FOR ALLERGY DIAGNOSIS For patients who are willing to pay a gap fee, Tasmanian Medical Laboratories is able to provide more extensive panels of allergen testing when needed. Certain patients may benefit from testing more than 4 allergens or allergen mixes at a time. To aid in requesting allergy tests, Tasmanian Medical Laboratories has developed the following panels: Panel 1: Inhalant - 10 House dust mite Blomia tropicalis (mite) Cockroach Mould mix Weed pollen mix Tree pollen mix Grass pollen mix Cat Dog Horse COMPONENT ALLERGY TESTING Panel 2: Childhood allergy - 15 House dust mite Grass pollen mix Cat Fish (cod) Dog Horse Cashew Mould mix Almond Milk Hazelnut Egg white Almond Wheat Panel 3: Allergenic foods - 20 Milk Egg white Wheat Sesame seed Cashew Almond Hazelnut Strawberry Banana Fish (cod) Oyster Shrimp (prawn) Rice Corn Potato Kiwi fruit Beef Mango Panel 4: Moulds and Mites - 10 Dust mite (D. pteronyssinus) Dust mite (D. farinae) Blomia tropicalis Acarus siro Apergillus fumigatus Alternaria alternata Cladosporium herbarum Penicillium notatum Botrytis cinerea Mucor racemosus Tasmanian Medical Laboratories offers a broad array of component (sometimes called molecular allergy) tests. Componentresolved diagnosis based on well-characterised individual allergen molecules is a major advance in allergy diagnosis. Table b: Recombinant and component allergens (subject to out-of-pocket charges as per table c) Name Common request term Name Common request term MUXF3, CCD (bromelain) CCD, bromelain, MUXF3 Paper wasp (rpol d 5 recombinant protein antigen 5) Pol d 5 ngal d 1, ovomucoid (egg) Ovomucoid Peach (rpru p 4 Profilin) Peach profilin nasp o 21 (enzyme alphaamylase) Alpha amylase, amylase (rara h 2) Ara h 2 Enzyme savinase Savinase (rara h 9, LTP) Ara h 9 rapi m 1 - phospholipase A2 (honey bee) Api m 1; phospholipase A2 Prawn or shrimp (rpen a 1, Tropomyosin) rhev b 5 (latex) Latex Hev b 5 Wheat (rtri a 19, Omega-5 Gliadin) Gal-alpha-1,3-gal thyroglobulin bovine Tropomysin Alpha-gal; Gal-alpha-1,3-Gal Wasp (rves v 5, Vespula) Ves v 5 IMMUNOCAP ISAC AT TASMANIAN MEDICAL LABORATORIES Omega 5 gliadin ImmunoCAP ISAC is a multiplex immunoassay platform based on modern biochip technology that allows for rapid, simultaneous measurement of specific IgE to over 100 allergen components in a single test. The ISAC system tests well-characterised individual allergen molecules, either purified natural or recombinant allergen components, rather than crude whole allergen extracts. Specific IgE to allergen components correlate better with the presence and nature of clinical reactions to allergen exposure than specific IgE to whole allergen extracts. ISAC testing offers a broad approach to investigation of disease-associated specific IgE. Clinical scenarios where ISAC is likely to be most beneficial include assessment of complex patients such as those with inconsistent histories, refractoriness to conventional therapy, multi-sensitised patients with symptoms due to allergen cross-reactivity or patients with anaphylaxis without a definable cause. For further information please consult the Tasmanian Medical Laboratories Immunocap ISAC brochure.
5 HOW TO ORDER Specific IgE: Request 'Specific IgE (RAST)' on a Tasmanian Medical Laboratories request form, followed by the individual allergens or mixes required for testing. In the case of the lab receiving unspecified requests for Specific IgE, allergen testing will be based on the patient s age and any clinical information supplied. In this scenario, the standard number of allergens/ mixes tested is three. A measurement of total IgE is useful in the interpretation of the significance of specific IgE and may be requested at the same time. Extended Specific IgE (Extended RAST): Write the name of the panel from the table above e.g. Extended RAST panel 1 or Extended sige panel 1 in the Tests Requested area of your Tasmanian Medical Laboratories request form. Component Allergy Testing: Please request individual component allergens by name for specific IgE testing. For example, 'specific IgE for Ara h2' or 'RAST for Ara h2'. ISAC Testing: Please request 'ISAC' on your Tasmanian Medical Laboratories request form. When possible, please provide brief clinical notes to assist with the interpretation of the ISAC results. TURNAROUND TIME RAST, Extended RAST and Component Testing: RAST testing is performed daily (Mon - Fri). Results are normally available within 72 hours from the time of collection. ISAC Testing: Approximately 4 weeks. COST FOR ALLERGY TESTING Specific IgE (RAST): The Medicare benefit for specific IgE testing allows 4 testing episodes in a 12 month period. If a request contains more than 4 allergens, or allergen mixes; initial testing will be done on 4 allergens with additional allergy tests being processed at fortnightly intervals, up to a maximum of 4 episodes per 12 month period. If it is required that more than 4 allergens or mixes be tested together in a single episode, an out-of-pocket charge will apply. Charges will also apply if there are more than 4 episodes of allergy testing within 12 months, or if component allergens are included in a request. Out-of-pocket charges are summarised in Table c. Extended Specific IgE (Extended RAST): These panels are not fully funded by Medicare and attract an out-of-pocket fee. The standard Medicare rebate for RAST testing is applicable. Please enquire through your local collection centre or medical liaison officer for costs. Component Allergy Testing: These panels are not funded by Medicare and attract an out-of-pocket fee. In order to provide a comprehensive repertoire of these useful tests, an out-of-pocket gap fee applies to each component allergen requested please see Table c. ISAC Testing: Testing will incur an out-of-pocket cost of $350.00*. Table c: Gap payment scenarios for allergy testing at Tasmanian Medical Laboratories Scenario Gap payment Comments > 4 allergens or mixes in a single episode $40.00 Non-specialist referrals only > 4 episodes within 12 months $60.00 per episode All referrals Component allergens $40.00 per component allergen All referrals ISAC $ No Medicare rebate available FURTHER INFORMATION For further information please call Hobart (03) or Launceston (03) Dr David Heyworth-Smith FRCPA FRACP Consultant Clinical Immunologist Immunology & Microbiology Department Dr Paul Campbell MB ChB, BSc (Hons), PhD (Oxford), FRCPA Consultant Immunologist, Immunology Ms Marie Hetherington Chief Scientist, Immunology To receive a copy of the Tasmanian Medical Laboratories doctor and patient brochures on allergy testing, please contact your MLO or enquiries@tmlpath.com.au
6 TML UPDATES Faecal Calprotectin: A Biomarker of Bowel Inflammation Calprotectin is a cytoplasmic protein released by activated neutrophils. Its biological function is to sequester calcium and zinc ions, and deny them to pathogens. Calprotectin released by mucosal or luminal neutrophils may be measured in faecal specimens as an index of bowel inflammation. As such, testing is useful in the assessment of patients with suspected or known inflammatory bowel diseases. WHEN TO ORDER Calprotectin levels correlate with the degree of bowel inflammation and it is stable for at least 3 days at room temperature. This test permits non-invasive, inexpensive and rapid assessment of bowel inflammation. An endoscopy may be required to help determine the cause of inflammation, signs, and symptoms. A faecal specimen is required because measurement of serum calprotectin does not correlate with mucosal inflammation. Normal levels of faecal calprotectin do not exclude the possibility of colorectal carcinoma and coeliac disease. The validity of measurement can be negatively affected by faecal heterogeneity and therapy using Aspirin, NSAIDs and PPIs. TESTING AT TASMANIAN MEDICAL LABORATORIES A faecal specimen is required; samples can remain stable for up to 72 hours. To order the test, request faecal or stool calprotectin level on a standard Tasmanian Medical Laboratories request form. This is a self-collect for patients; please ensure patients understand the procedure required. Our collection centres can provide faeces collection kits for your patient or clinic. Results are usually available within 3-4 working days. There is currently no Medicare rebate for this test and as such, Tasmanian Medical Laboratories will charge an out-of-pocket fee of $75 *. For more information regarding faecal calprotectin or to receive a copy of the doctor and patient brochures please contact your MLO or enquiries@tmlpath.com.au Blood Tests in Investigation of Coeliac Disease The diagnosis of suspected coeliac disease (CD) involves serological testing for antibodies, and upper intestinal endoscopy with histological examination of a small bowel biopsy for confirmation in most cases. Endoscopy with biopsy findings confirms serological results and may exclude other causes of gastrointestinal pathology. CD is associated with the MHC alleles HLA-DQ2 and HLA-DQ8 and coeliac genotyping is also useful in certain circumstances. ANTIBODY MEASUREMENT IN INVESTIGATION Serological investigation of CD involves the detection of antibodies to gliadin (deamidated gliadin protein or DPG) and auto-antibodies to the antigen tissue transglutaminase. Thus, relevant assays are measurement of anti-gliadin antibodies and anti-tissue transglutaminase antibodies. In CD, measurement of antibodies of IgA isotype provides optimal sensitivity and specificity (in contrast to most autoimmune disorders in which the antibodies tested for are of IgM or IgG isotype). IgG antigliadin testing is useful in infants and in patients with IgA deficiency. Antibody measurement is useful both diagnostically and also to monitor compliance with a gluten-free diet. GENOTYPING As a negative HLA-DQ2/ DQ8 status means CD is unlikely, coeliac genotype assessment may be useful when there are equivocal serological or biopsy results, or when a patient is on a gluten-free diet and does not wish to undergo a gluten challenge. However, a positive HLA-DQ2/DQ8 status is not diagnostic as these are permissive genetic factors only and approximately 25-30% of the Australian population are HLA-DQ2/DQ8 positive, whereas only 1-2% of the population have CD. TESTING AT TASMANIAN MEDICAL LABORATORIES Please request coeliac serology on a standard Tasmanian Medical Laboratories request form. This generates a result for anti-tissue transglutaminase IgA antibodies and antigliadin IgG antibodies. Results are usually available within 3 working days. This test is bulk-billed subject to Medicare guidelines and criteria. To request assessment of HLA DQ2/DQ8 status please request coeliac genotype. Results are usually available within 1 week. This test may be requested as a bulk-billed test, subject to Medicare guidelines and criteria. For more information regarding laboratory investigation of coeliac disease or to receive a copy of the doctor and patient brochures please contact your MLO or enquiries@tmlpath.com.au *Prices, where displayed, are correct at time of printing and subject to change without notice.
7 247 Wellington St Launceston Tasmania Argyle St Hobart Tasmania 7000 April 10, st May - Changes to Cervical Screening Further to the recent postponement in implementing the new National Cervical Cancer Screening Program, a new item number will be introduced for liquid based cytology commencing on Monday, 1st May. From this date, the following billing practices will be applied: Referral May 1st to November 30th, 2017 Conventional smear only Liquid based cytology only (Thinprep or Surepath) Conventional smear AND liquid based cytology HPV screening (non-mbs rebateable) Charges Bulkbill Bulkbill $35 out of pocket fee $40 out of pocket fee HPV testing for test of cure (MBS Item 69418) will continue to be performed according to the same Medicare criteria until the new National Cervical Cancer Screening program is introduced on 1st December this year. The postponement of the conversion to HPV screening has provided a number of challenges for our cytology teams in managing this transition. The out-of-pocket fee for referrals where both conventional smear and liquid based cytology referrals are received is to assist our efforts in providing better turnaround times for routine screening. We would like to thank you for your patience and understanding of the recent extension in turnaround times. Providing you and your patients with reliable and accurate results in a timely and hassle-free manner is key for us, which is why we are committed to working closely with you throughout the coming months. Your local Medical Liaison Officer will be in contact with you to assist as these changes are implemented. In the meantime, please feel free to contact us directly if we can be of any assistance. Yours sincerely, Dr Jason Stone Head of Cytopathology Gwenda Lawrence Manager, Cytology
8 TML UPDATES Changes to Medicare Eligibility for QuantiFERON Tuberculosis Testing from 1 May 2017 Patients may now be eligible for a bulk-billed test, subject to the following Medicare guidelines and criteria. MBS Item Test of cell s mediated immune response in blood for the detection of latent tuberculosis by interferon gamma release assay (IGRA) in people who: (a) Have been exposed to a confirmed case of active tuberculosis. (b) Are infected with human immunodeficiency virus. (c) Are to commence, or have commenced, tumour necrosis factor (TNF) inhibitor therapy. (d) Are to commence, or have commenced, renal dialysis. (e) Have silicosis. (f ) Are, or are about to become, immunosuppressed because of a disease, or a medical treatment, not mentioned in paragraphs (a) to (e). INFECTIOUS DISEASES REPORT: MARCH 2017 Further historical clinical data can be obtained by contacting enquiries@tmlpath.com.au. CLINICAL DATA ORGANISM GROUP OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH TOTAL Adenovirus (not typed) 1 1 Adenovirus (typing pending) 1 1 Bordetella pertussis Chlamydia trachomatis, not typed Epstein-Barr virus (EBV) Hepatitis B virus Hepatitis C virus Herpes simplex Type Herpes simplex Type Human Metapneumovirus 1 1 Influenza A virus Influenza B virus 1 1 Measles virus 1 1 Neisseria gonorrhoeae Parvovirus Respiratory Syncytial virus Rhinovirus (all types) Ross River virus Toxoplasma gondii 2 2 Treponema pallidum Varicella Zoster virus TOTAL
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