title: Anaphylaxis to carrageenan: a pseudo-latex allergy.
abstract: BACKGROUND
  Anaphylactic reactions during a barium enema have been attributed to allergy to latex on the barium enema device. The observation of anaphylaxis during barium enema without latex exposure or latex allergy led to the performance of an allergy skin test to the barium enema solution.
  
  
  METHODS
  Individual components of the barium enema solution were obtained for double-blind skin testing. A RAST to identify specific IgE antibodies to the skin test active agent was established.
  
  
  RESULTS
  Carrageenan, a component of the barium enema solution, produced positive reactions to allergy skin test and RAST. Gastrointestinal symptoms for which the patient was being investigated by the barium enema subsequently disappeared with a diet free of carrageenan.
  
  
  CONCLUSIONS
  Carrageenan is a previously unreported cause of anaphylaxis during barium enema. It is an allergen widely distributed in common foods and potentially could account for some symptoms related to milk products or baby formula.
authors.affiliation: Toronto Hospital, Western Division, Ontario, Canada.
authors.forename: S M
authors.initials: SM
authors.lastname: Tarlo
authors.forename: J
authors.initials: J
authors.lastname: Dolovich
authors.forename: C
authors.initials: C
authors.lastname: Listgarten
mesh_terms: D000707:Anaphylaxis / Q000209:etiology* / Q000276:immunology; D001464:Barium / Q000009:adverse effects*; D002351:Carrageenan / Q000009:adverse effects* / Q000276:immunology; D004733:Enema / Q000009:adverse effects*; D005260:Female; D005767:Gastrointestinal Diseases / Q000209:etiology* / Q000276:immunology; D006801:Humans; D007840:Latex / Q000009:adverse effects
chemical_list: D007840:Latex; D001464:Barium; D002351:Carrageenan