Use to diagnose carcinoid tumors and monitor disease.
Quantitative High Performance Liquid Chromatography - Tandem Mass Spectrometry
Patients should abstain, if possible, from medications, over-the-counter drugs, and herbal remedies for at least 72 hours prior to the test. Foods rich in serotonin (avocados, bananas, eggplant, pineapple, plums, tomatoes, walnuts) and medications that may affect metabolism of serotonin must be avoided at least 72 hours before and during collection of urine for HIAA.
24-hour or random urine. Refrigerate 24-hour specimens during collection.
Transfer 4 mL aliquot from a well-mixed 24-hour or random collection to an ARUP Standard Transport Tube. (Min: 1 mL) Record total volume and collection time interval on transport tube and test request form.
Any sample except urine.
Please see Note for a more comprehensive list of dietary restrictions.
Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 2 months
|5-HIAA Urine - per 24h||0.0-15.0 mg/d|
|5-HIAA Urine - per volume||The HIAA-to-creatinine ratio will be reported whenever the urine collection is random or other than 24 hours, or the urine volume is less than 400 mL/24 hours.
0-14 mg/g crt
|Creatinine, Urine - per 24h||
5-Hydroxyindoleacetic acid (5-HIAA) results are expressed as a ratio to creatinine excretion (mg/g CRT). HIAA mass per day (mg/d) is not reported if urine collection is random, other than 24 hours, or for a urine volume less than 400 mL/d. No reference interval is available for results reported in units of mg/L. Increased urine 5-HIAA concentration is common and may be the result of improper specimen collection, consumption of serotonin containing foods or dietary supplements, drug interference, or malabsorption syndromes. Significant elevation (ten times the upper reference limit) of urine 5-HIAA may indicate the presence of a carcinoid tumor.
Laboratory Developed Test (LDT)
Foods and medications associated with altered urinary HIAA results:
Decreased HIAA: Aspirin, chlorpromazine (Thorazine), corticotropin, dihydroxyphenylacetic acid, alcohol, gentisic acid, homogentisic acid, hydrazine derivatives, imipramine (Tofranil®), isocarboxazid (Marplan), keto acids, levodopa, MAO inhibitors, methenamine, methyldopa (Aldomet®), perchlorperazine, phenothiazines (Compazine®), promazine, promethazine (Mepergan®).
Increased HIAA: Acetaminophen, acetanilide, caffeine, coumaric acid, diazepam (Valium®), ephedrine, fluorouracil, glycerol guaiacolate (Guaifenesin), melphalan (Alkeran®), mephenesin, methamphetamine (Desoxyn), methocarbamol (Robaxin®), naproxen, nicotine, phenacetin, phenmetrazine, phenobarbital, phentolamine, rauwolfia, reserpine.
|Component Test Code*||Component Chart Name||LOINC|
|0020207||Creatinine, Urine - per volume||2161-8|
|0020208||Creatinine, Urine - per 24h||2162-6|
|0080238||5-HIAA Urine Interpretation||44909-0|
|0080320||5-HIAA Urine - per 24h||1695-6|
|0080321||5-HIAA Urine - per volume||31203-3|
|0081343||5-HIAA Urine - ratio to CRT||44288-9|
- 5-OH-Indoleacetic Acid
- Hydroxyindoleacetic Acid
- Serotonin Metabolite