Laboratory Studies
Generally, the diagnosis of scombroid toxicity is clinical; no laboratory tests are necessary. It can sometimes be difficult to distinguish a true food allergy from scombrotoxism, especially in isolated cases. The absence of any history of allergic reactions to the same food, especially if combined with a cluster of cases associated with eating the same meal, can be helpful in making this distinction, since these would suggest a diagnosis of scombroid toxicity. One recent study has suggested that serum tryptase levels, if obtained very early (1-2 h from symptom onset), may also help to make this determination; if tryptase levels are elevated, an allergic reaction is more likely, since the tryptase level is usually within the normal range in histamine food poisoning.[8]
If the diagnosis requires confirmation, histamine levels can be measured in a piece of frozen suspect fish.[4, 7]
Other Tests
- In patients in whom palpitations are a predominant symptom, an ECG may be necessary.
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