Test Catalog

Test ID: HIAA    
5-Hydroxyindoleacetic Acid, 24 Hour, Urine

Method Description Describes how the test is performed and provides a method-specific reference

5-Hydroxyindoleacetic acid (5-HIAA) is measured by solid phase extraction (SPE) of an aliquot from a 24-hour urine collection and liquid chromatography/tandem mass spectrometry (LC-MS/MS) analysis. 5-HIAA is quantitated using a custom synthesized stable isotope labeled internal standard (d6-5-HIAA) from calibration over a concentration range 0.5 to 150 mg/L.(Kroll CA, Magera MJ, Helgeson JK, et al: A liquid chromatography-tandem mass spectrometry method for the determination of 5-hydroxyindole-3-acetic acid in urine. Clin Chem 2002;48:2049-2051, Calanchini M, Tadman M, Krogh J, Fabbri A, Grossman A, Shine B: Measurement of urinary 5-HIAA: correlation between spot versus 24-h urine collection. Endocr Connect 2019 Aug 1;8(8):1082-1088)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Monday through Thursday; 11 a.m.

Friday; 2 p.m.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

2 days (not reported on Saturday or Sunday)

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Clinic Laboratories until the release of the test result

4 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

7 days

Performing Laboratory Location Indicates the location of the laboratory that performs the test