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5-HIAA
Definition:
This is a test that measures the amount of 5-HIAA in urine. Alternative Names:
HIAA; 5-hydroxyindole acetic acid; Serotonin metabolite Text Continues Below
How the test is performed:
The health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. A 24-hour urine sample is needed: - On day 1, urinate into the toilet upon arising in the morning.
- Collect all subsequent urine (in a special container) for the next 24-hours.
- On day 2, urinate into the container in the morning upon arising.
- Cap the container. Keep it in the refrigerator or a cool place during the collection period. Label the container with your name, the date, the time of completion, and return it as instructed.
For a infant, thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on your infant. For boys, the entire penis can be placed in the bag and the adhesive attached to the skin. For girls, the bag is placed over the labia. Place a diaper over the infant (bag and all). The infant should be checked frequently and the bag changed after the infant has urinated into the bag. For active infants, this procedure may take a couple of attempts -- lively infants can displace the bag, causing an inability to obtain the specimen. The urine is drained into the container for transport to the laboratory.
Deliver it to the laboratory or your health care provider as soon as possible upon completion. The lab analyzes the sample for the amount of 5-HIAA. How to prepare for the test:
The health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. Refrain from eating foods that contain interfering substances for 3 days before the test. (see Special Considerations.)
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