Foods generally rich in serotonin such as bananas, pineapple, plums, kiwi fruit, tomatoes, avocados, various nuts, and chocolate should be avoided a few days before sample collection. Drugs/substances such as imipramine, isoniazid, isocarboxazid, methyldopa, levodopa, MAO-inhibitors, general OTC-medication, alcohol, paracetamol, diazepam, oxprenolol, atenolol, phenothiazines, indomethacin, naproxen, reserpine, glyceryl-guaiacolate have an influence on urinary 5-HIAA levels and should be discontinued a few days before State 24 Hrs urine volume Adjust pH to (3-6) with HCl
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