5-HIAA 24 hour Urine Collection Test Urinary 5-HIAA (5-hydroxyindoleacetic acid) 5-HIAA is a breakdown product of a hormone called serotonin which is excreted from the body in urine. It is an indirect way to measure how much serotonin is in the body. Serotonin can be...
Unfortunately we are having to close our Helpline on Tuesday 6th October - however it will be open as usual on both Wednesday 7th and Thursday 8th.
