ImmunoCAP: Detection of allergen-specific IgE - Victoria Heath

From Clinical Immunology, part of the Fundamentals of Biomedical Science series. Victoria Heath, from the Infection and Immunity Laboratory at Charing Cross Hospital, demonstrates the use of the ImmunoCAP in the detection of allergen-specific IgE.
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11:35 (Assay principle) It is stated that the concentration of allergen specific IgE is determined using a calibration curve created using known concentrations of allergen. How is that done? Is it a competitive assay? Or should it be "known concentrations of allergen specific IgE"?