Why get tested?
To help diagnose and monitor treatment for a serotonin-secreting carcinoid tumor

When to get tested?
When you have symptoms suggestive of a carcinoid tumor such as flushing, diarrhea, and/or wheezing, and at intervals following treatment

Sample required?
A 24-hour urine sample; rarely a random urine sample

Note: You may be instructed to avoid certain foods and medications prior to this test.