|Test Code||HIAAU / HIAA-M|
|Test||5-HYDROXYINDOLEACETIC ACID (5-HIAA), 24-HOUR URINE|
|Methodology||Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)|
|Description||Useful as a screening test for carcinoid tumors and for monitoring therapy of carcinoid tumors.|
|Specimen||5 mL (minimum: 1.0 mL) from a 24-hour urine collection. Add 25 mL of 50% acetic acid as preservative at start of collection. Use 15 mL of 50% acetic acid for children < 5 years old. This preservative is intended to achieve a pH of between approximately 2.0 and 4.0. See "Urine Preservatives" for multiple collections. Send specimen refrigerated in a plastic, 13-mL tube.
|Reference Values||<= 6 mg/24 hours|
|Analytic Time||2 Days|
|Day(s) Test Set Up||Monday through Friday|