Larger skin prick test (SPT) wheal size and higher serum specific IgE (sIgE) level predict lower rates of resolution, for example, an egg SPT > 4 mm or sIgE > 1.7 kU/L at 1 year of age was predictive of persistent egg allergy at 2 years of age (OR 3.32 and 29.46 respectively) [18••]. Here, IGHE is linked to egg allergy.