Fig. 1

In vivo and in vitro IgE detection. a Quantitative SPT for a commercially available array of food allergens. Results are expressed in terms of Skin Index, i.e., the ratio between the area of the allergen wheal and the area of the exogenous histamine (10 mg/ml) reference wheal. b Quantitative SPT for commercially available egg extract (egg white and yolk), and prick-by-prick with cooked egg (egg white and yolk), and baked egg (sponge cake). Results expressed in terms of Skin Index, also. c Total serum IgE and egg allergen-specific serum IgE, as measured by ImmunoCAP. d Quantitative SPT with MMR vaccine (undiluted); quantitative intradermal tests with MMR vaccine, at 1:100 and 1:10 dilutions, respectively. Results are expressed as wheal areas (mm²). Exogenous histamine (0.002 mg/ml) was used for positive control in intradermal testing