What is the 24-Hour Urine 5-HIAA Test?

5-HIAA is a breakdown product of serotonin, a neurotransmitter involved in many bodily functions. Elevated levels of 5-HIAA in a 24-hour urine collection are a key indicator of carcinoid tumors, which often secrete excess serotonin. Measuring 5-HIAA over a full day provides an accurate picture of serotonin production in the body, aiding diagnosis and monitoring of carcinoid syndrome.

Why Is the Test Done?

1. To diagnose or monitor carcinoid tumors and carcinoid syndrome

2. To evaluate symptoms like flushing, diarrhea, and wheezing that may be related to serotonin-producing tumors

3. To assess treatment effectiveness in patients with known neuroendocrine tumors

How Is the Test Performed?

1. You will collect all urine in a special container over 24 hours, starting after your first morning urination and including the first urination the next morning.

2. It's important to follow dietary restrictions and avoid certain foods like bananas, walnuts, and tomatoes, which can affect results.

3. The collected urine is analyzed using advanced techniques like liquid chromatography/mass spectrometry for precise measurement.

4. The process is painless but requires attention to accurately collecting all urine during the period.

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Preparing for the Test

• Avoid serotonin-rich foods and some medications as advised by your doctor, typically for at least 24 hours before and during the collection.

• Follow precise collection and storage instructions to maintain sample integrity.

• Inform your healthcare provider about any medications or supplements you are taking.