Mast cell tryptase levels may be elevated if the attack was due to an acute allergic (anaphylactic) reaction. When the patient has been stabilized, particular investigations may clarify the exact cause; complement levels, especially depletion of complement factors 2 and 4, may indicate deficiency of C1-inhibitor. HAE type III is a diagnosis of exclusion consisting of observed angioedema along with normal C1 levels and function. The hereditary form (HAE) often goes undetected for a long time, as its symptoms resemble those of more common disorders, such as allergy or intestinal colic. An important clue is the failure of hereditary angioedema to respond to antihistamines or steroids, a characteristic that distinguishes it from allergic reactions. It is particularly difficult to diagnose HAE in patients whose episodes are confined to the gastrointestinal tract. Besides a family history of the disease, only a laboratory analysis can provide final confirmation. In this analysis, it is usually a reduced complement factor C4, rather than the C1-INH deficiency itself, that is detected. The former is used during the reaction cascade in the complement system of immune defense, which is permanently overactive due to the lack of regulation by C1-INH. Angioedema is classified as either hereditary or acquired. Acquired angioedema
Acquired angioedema (AAE) can be immunologic, nonimmunologic, or idiopathic. It is usually caused by allergy and occurs together with other allergic symptoms and urticaria. It can also occur as a side effect to certain medications, particularly ACE inhibitors.
Zingo is a Swedish soft drink, with a carbonated orange flavor. Zingo was introduced during the 1950s as Ingo-dricka ("Ingo drink"), named after the boxer Ingemar "Ingo" Johansson. After Ingo lost the world championship in heavy weight boxing, the drink was renamed Zingo in 1962. Originally Zingo was produced in Norrköping, Sweden by Pripps. Pripps was bought by Carlsberg in 2000 and they continue to manufacture Zingo. Sources
Carlsberg Sweden
Swedish Wikipedia on Zingo

See also
Zingo-nostalgi!