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Histamine is a chemical responsible for numerous symptoms of allergic reaction. The amount present in the blood or urine can help confirm or rule out the presence of an allergy. For three days prior to the test, avoid ingesting foods that increase histamine levels (particularly cheeses and sauerkraut). A blood sample or urine sample will be taken and then analysed. Extremely high levels may indicate mastocytosis, or possibly cancer. Note that false-positive and false-negative results are possible. Depending on the results, further testing may be recommended.
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