What is the role of histamine measurement in the diagnosis of anaphylaxis?

Updated: May 16, 2018
  • Author: S Shahzad Mustafa, MD; Chief Editor: Michael A Kaliner, MD  more...
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Answer

If a patient is seen shortly after an episode, plasma histamine or urinary histamine metabolites, or serum tryptase measurements may be helpful in confirming the diagnosis. [2]

Plasma histamine levels rise within 10 minutes of onset but fall again within 30 minutes. Urinary histamine levels are generally not dependable, as this test can be affected by diet and by bacteria in the urine. Urinary histamine metabolites measurement is a better test but is not generally available.


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