A 5-HIAA test is a urine test that measures the levels of 5-hydroxyindoleacetic acid (5-HIAA) in the body. 5-HIAA is a metabolite of serotonin, a neurotransmitter that plays a role in regulating mood, sleep, appetite, and other functions. High levels of 5-HIAA can indicate the presence of a tumor in the digestive tract.
The 5-HIAA test measures the amount of 5-HIAA in a urine sample. It is typically ordered when a person has symptoms of a tumor in the digestive tract, such as abdominal pain, persistent nausea, vomiting, or blood in the stool. It can also be used to monitor treatment for tumors.
The test is performed by collecting a urine sample in the morning and sending it to a laboratory for analysis. The laboratory will measure the amount of 5-HIAA in the sample and compare it to normal levels. High levels of 5-HIAA can indicate the presence of a tumor in the digestive tract. If the levels are low, it may suggest that the tumor has been successfully treated.
The 5-HIAA test is used to diagnose and monitor tumors in the digestive tract. It is important to note that a high level of 5-HIAA does not always indicate the presence of a tumor. Other conditions, such as kidney dysfunction or certain medications, can also cause elevated levels of 5-HIAA. Therefore, it is important to discuss the results of the test with your doctor in order to determine the appropriate treatment.