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5-Hydroxy Indole Acetic Acid (5-HIAA)
Measures urine breakdown product of serotonin to help detect and monitor neuroendocrine (carcinoid) tumors and symptoms.
What is a 5-Hydroxy Indole Acetic Acid (5-HIAA) Test?
The 5-Hydroxy Indole Acetic Acid (5-HIAA) test measures the amount of serotonin breakdown product in urine. Serotonin is a chemical the body makes that affects the gut and blood vessels. High 5-HIAA levels often point to serotonin-producing neuroendocrine tumors, commonly called carcinoid tumors. Doctors use this test to help diagnose carcinoid syndrome and to monitor treatment or tumor recurrence. Results must be read with clinical symptoms and other tests. Foods and many medicines can raise levels. Your doctor will give preparation instructions to reduce false positives. Results guide further imaging or specialist referrals.
5-Hydroxy Indole Acetic Acid (5-HIAA) Test Preparation
Avoid serotonin-rich foods and some medications 48-72 hours before urine collection.
5-Hydroxy Indole Acetic Acid (5-HIAA) Test Parameters
The 5-Hydroxy Indole Acetic Acid (5-HIAA) test evaluates various parameters related to the different components. Here are the main parameters that are checked in the test:
Why Take a 5-Hydroxy Indole Acetic Acid (5-HIAA) Test?
5-Hydroxy Indole Acetic Acid (5-HIAA) is commonly included in neuroendocrine tumor and carcinoid syndrome evaluations. Doctors may order it if you have unexplained flushing, diarrhea, wheezing, or abdominal pain. It helps diagnose serotonin-producing tumors and monitors response to treatment or recurrence. Abnormal results can come from diet, certain medicines, or tumors. A family history of endocrine cancer may prompt testing during follow-up.
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Thank you, Rinku. I appreciate your help during my visit. The hospital staff were courteous and professional. Overall, a very good experience!
Vijay Bisht was friendly, helpful, and made our home test process seamless. Grateful for his timely support and follow-up.
A big thank you to Shikhar from the Visit app for going above and beyond to arrange a last-minute appointment during an urgent situation. His seamless coordination truly made a difference.
A clean facility enhances experience. Quick checkups are a plus. Miss Rinku from Aditya Birla Health Insurance provided excellent service and handled our files well.
“The service was excellent—she was helpful, efficient, and made my recovery smooth and stress-free. Her support made a real difference.”
“Thank you, Shared Gupta, for the great support with my reimbursement claims and Wipro health packages. Truly appreciated!”
Thank you, Rinku. I appreciate your help during my visit. The hospital staff were courteous and professional. Overall, a very good experience!
I want to share my feedback on the help I received for my health checkup. I was happy with the guidance and support. Thank you for your assistance; it made the experience stress-free.
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Hi Aniket, Annu, Mayur, I appreciate Shikhar's support in organizing clinic appointments for my child at odd hours. It's a sensitive matter for any parent, and I'm thankful for his understanding.
I want to share my feedback on the help I received for my health checkup. I was happy with the guidance and support. Thank you for your assistance; it made the experience stress-free.
Huge shoutout to Shikhar from the Visit app! He has been incredibly supportive during emergencies — always responsive and ready to help. Truly impressed by his dedication and calm efficiency.
“I connected with the concierge team today and spoke with Vijay—he was helpful and made a real effort to address my concerns.”
I appreciate Shreshta's outstanding support. She kept me updated on my medicals after hours and ensured everything went smoothly. Her proactive communication and care made a big difference.
“Grateful to Shikhar for finding a cataract specialist at a convenient time and ensuring a smooth experience. A true asset to the Visit team!”
Hi Aniket, Annu, Mayur, I appreciate Shikhar's support in organizing clinic appointments for my child at odd hours. It's a sensitive matter for any parent, and I'm thankful for his understanding.