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Worcestershire Acute Hospitals NHS Trust
5-Hiaa (Quantitative)
CategoryClinical Biochemistry
Test information
Used in the investigation of carcinoid tumours Carcinoid syndrome associated with flushing of face, diarrhoea, a rapid heart rate and wheezing.  Sent if positive screen at Hereford or monitoring known carcinoid patient.
24h urine collection for 5HIAA patient information leaflet: https://www.worcsacute.nhs.uk/patient-information-and-leaflets/documents/patient-information-leaflets-a-z/2780-24-hour-urine-collection-for-5hiaa 
Check pH of sample. If pH >4 then add 50% HCl drop-wise until pH <4. Measure volume.
Special requirements
24h acidified pH <4
Tube type
Acidified urine
Minimum volume
10 mL
TAT Inpatient
2 weeks
TAT GP/Outpatient
2 weeks
Referral lab
Dept of Clinical Chemistry and Immunology, Heartlands Hospital
Page last updated: 11 January 2022