알레르겐에 의한 팽진이 히스타민에 의한 팽진의 크기와 같거나 큰 경우가 한 개 이상인 경우를 양성으로 판독하였다.
A instance in which several cases by which the allergen-induced wheal was add up to or greater than the size associated with the histamine-induced wheal was read as positive.