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5-HIAA

Alternative names:

5-hydroxyindole acetic acid; HIAA; serotonin metabolite

What the risks are:

There are no risks.

Special considerations:

Drugs that can increase 5-HIAA measurements include acetanilid, phenacetin, glyceryl guaiacolate (found in many cough syrups), methocarbamol, and reserpine.

Drugs that can decrease 5-HIAA measurements include chlorpromazine, heparin, imipramine, isoniazid, levodopa, monoamine oxidase inhibitors, methenamine, methyldopa, phenothiazines, promethazine, and tricyclic antidepressants.

Foods that can interfere with 5-HIAA measurements include plums, pineapples, bananas, eggplant, tomatoes, avocados, and walnuts. Do not eat them for 3 days before the test.


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