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The Neuroendocrine Tumor Research Foundation directs your individual donations to breakthrough scientific research. Since 2005, we have funded $36 million in research projects. The Neuroendocrine Research Foundation is a 501(c)(3) organization, so all donations are fully tax-deductible to the extent allowed by law. We are grateful to you for your generosity.
Home » For Patients » NET Tests & Treatments » Testing » Urine Tests
Hydroxyindoleacetic acid (5-HIAA) is a breakdown product of the hormone serotonin. Neuroendocrine tumors can secrete this hormone. Since serotonin levels go up and down throughout a normal day, a 24-hour urine collection of the 5-HIAA byproduct is a more reliable measurement of daily amounts of the hormone. Your doctor may use the 5-HIAA test in diagnosing and monitoring neuroendocrine cancer.
There may also be prescription and over-the-counter medications to avoid before a 5-HIAA urine check. Make sure to get a complete list of foods and medications to avoid before the 5-HIAA test from your doctor.
15National Comprehensive Cancer Network® (NCCN). NCCN Guidelines Neuroendocrine and Adrenal Tumors. (Version 3.2018) https://www.nccn.org/professionals/physician_gls/PDF/neuroendocrine.pdf. Accessed October 24, 2018