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HIAAU / HIAA-M
5-HYDROXYINDOLEACETIC ACID (5-HIAA), 24-HOUR URINE

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.

NOTE:
1. Patient should not eat avocados, bananas, butternuts, canteloupe, dates, eggplant, grapefruit, hickory nuts, honeydew, kiwi fruit, melons, nuts, pecans, pineapple, plantain, plums, tomatoes, or walnuts for a 48-hour period prior to start of collection.
2. 24-HOUR VOLUME IS REQUIRED ON REQUEST FORM FOR PROCESSING.
3. Follow "Urine Collection" instructions. 

Reference Values <= 6 mg/24 hours 
Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 83497  

Special Instructions