Test directory: 5-HIAA, 24Hr Urine w/Creatinine

Ordering Code 279
Test Name 5-HIAA, 24Hr Urine w/Creatinine
Alias 5-Hydroxyindoleacetic Acid (5-HIAA), 24Hr Urine w/Creat
Serotonin Metabolite
Preferred Specimen Urine, 24 Hour 10 mL (5 mL minimum) aliquot from a 24-hour urine that has been preserved with 25 mL 6N HCl, collected in a plastic, 24-hour urine container
Preferred Container 24 Hour Urine Container
Other Specimen/Container Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen
Aliquot from a 24-hour urine, unpreserved, with a pH < or = 6, collected in a plastic, 24-hour urine container
Optimum Volume 10 mL
Collection Instructions Collect 24-hour urine with 25 mL 6N HCl to maintain a pH < or = 3. If no preservative is used, specimen must be stored refrigerated during collection but shipped frozen and pH must be < or = 6. Record 24-hour urine volume and patient's age on test request form and on urine container.
Handling Instructions Adjust to pH<3 with 6N HCl.
Transport Requirements Oahu: Refrigerated
Airline: Refrigerated
Preserved Urine: Room temperature
Unpreserved Urine: Frozen
Specimen Stability Unpreserved Urine:
Room temperature and Refrigerated: Unacceptable
Frozen: 30 Days
Preserved Urine:
Ambient: 1 Week
Refrigerated: 1 Month
Frozen: 1 Month
Rejection Criteria Preserved urine received refrigerated with pH >3,
Unpreserved urine received frozen with pH >6
Avail. Stat NO
Analytic Time 3-7 Days
Methodology High Performance Liquid Chromatography, Electrochemical
Detection
Reference Lab  Quest Diagnostic Lab-NI

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Total Volume ALL See report.
Creatinine, 24 Hr Urine ALL See report.
5-Hydroxyindoleacetic Acid ALL See report.