IgE and IgG4 testing
BLOOD
Venepuncture was performed prior to the OFC. Blood collection was repeated if the OFC was performed more than 6 months after blood collection. Total IgE, sIgE and IgG4 to egg, EW, ovalbumin and ovomucoid were determined using the standardised immunoenzymatic assay ImmunoCAP (Thermofisher). For IgE levels above 100 KU