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Blood Sciences

Blood Test Information

(a.k.a 5-hydroxyindoleacetic acid, serotonin metabolites)
24 Hour Urine (acid Preservative)(Phone (82)4712 to order)

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Test Code: 5HI

Tube type: Acid 24hr Urine

Special instructions
Sent away to Bristol Royal Infirmary

Reference range

mmol/mol (5HIAA/Creatinine)

Turnaround Time
28 days

Department: Biochemistry

Clinical Application
Please note dietary and medicinal restrictions must be followed.
Please avoid the following foods for 3 days before, and during the collection: aubergine (egg plant), avocado,bananas, broccoli, hickory nuts, kiwi, pecans, pineapple (and juice), plantain, plums, tomatoes (including all tomato based foods/sauces), walnuts.
As well as the foods listed above, the following medications should also be avoided, if possible, for 3 days before, and during the collection: beta-blockers, cough mixture, diazepam, indomethacin, naproxen, paracetamol, mephenesin.
Other medications may also cause changes in 5-HIAA metabolism (e.g. SSRIs): please state current medications on the request form.

» Patient Instructions for 5HIAA Acidified 24hr Urine Collection


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