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Because C1-INH levels can be falsely low in the first year of life, confirmatory testing should be done after age 1 year.[3],[4] Resources for patients and health care professionals A patient organization, HAE Canada (https://haecanada.org/), provides resources for patients and caregivers. Hereditary angioedema should be considered in the differential diagnosis of any patient presenting with unexplained abdominal pain and recurrent episodes of angioedema (particularly if asymmetric in nature) without urticaria. Hereditary angioedema (HAE) is a rare autosomal dominant disorder characterized by recurrent episodes of painful (and usually asymmetric) swelling without urticaria that leads to substantial morbidity and even mortality (in the case of laryngeal involvement) if left untreated. [Extracted from the article]