Urinary 5HIAA, 5-Hydroxyindoleacetic acid
Diagnosis and monitoring of carcinoid tumours. Some tumours may
not secrete 5-HIAA and levels of 5-hydroxytryptophan and
5-hydroxytryptamine may need to be measured.
Serum chromogranin levels are probably better than 5HIAA for
Request on ICE
Drug therapy must be stated on form
The following drugs should be avoided if possible:
The following foods should be avoided during urine
24 hour urine collection into acid preservative
Acidified 24 hour urine container
All drugs should be recorded on request form.
Causes for Rejection
Inadequately labelled sample
Less than 50 µmol/24 hours.
In patients with carcinoid, levels are typically in the range