Trial reportActa paediatrica (Oslo, Norway : 1992)2014
Establishing IMMULITE® 2000 cut-off values for serum allergen-specific immunoglobulin and exploring their relationship to exhaled nitric oxide.
Trial report in Acta paediatrica (Oslo, Norway : 1992), 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors at 2 institutions in 1 country.
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Abstract
aimPaediatric cut-off values for serum allergen-specific IgE (sIgE) using the Siemens IMMULITE(®) 2000 system to diagnose allergic rhinoconjunctivitis have not been established. We aimed to determine cut-off levels for sIgE for 10 common inhalant allergens and to study the relationship between sIgE, total IgE and fractional exhaled nitric oxide (FENO ).
methodsWe enrolled 243 schoolchildren, including 164 with allergic rhinoconjunctivitis. Parental interviews, skin prick tests, sIgE, total IgE, FENO measurements, spirometry and exercise tests were performed.
resultsCut-off values with the best combined sensitivity and specificity were above the detection limit of the assay for seven of the ten allergens (0.23-1.1 kU/L). The overall accuracy of the IMMULITE(®) in detecting allergic rhinoconjunctivitis was good. sIgE was superior to total IgE and FENO in predicting allergic rhinoconjunctivitis to timothy, birch, mugwort, cat, dog and house dust mite. FENO was elevated in children with allergic rhinoconjunctivitis, irrespective of asthma.
conclusionCut-off values for sIgE were dependent on the allergic phenotype and were above the IMMULITE(®) detection limit for seven of ten inhalant allergens. Consequently, using the detection limit for sIgE as the decision point would result in over-diagnosing allergic rhinoconjunctivitis. When measuring elevated FENO in children, allergic rhinoconjunctivitis should be suspected.
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