laboratory diagnostic - hormones - others - 5-HIAA - 5-hydroxyindoleacetic acid urines - serotonin metabolism, screening and monitoring carcinoid tumors, apudoma, 24 hr urine. Specify diuresis; DIET: within 48 hours prior to the assay, avoid consuming bananas, chocolate, dried fruit, citrus fruit, avocados, tomatoes, plums, kiwis, pineapples and molluscs. Treatment with beta-blockers drugs may interfere with test, HPLC, ssso, todylaboratories®, bmn, code L16LD1838