24-hour urine excretions of 5-hydroxyindoleacetic acid (5HIAA) have been measured in 13 children with coeliac disease before treatment. All were excreting more 5HIAA than an age-matched group of 22 control children. On introduction of a gluten-free diet clinical remission was accompanied by ...
24-hour urine for 5-HIAA: 2-8 mg/24 hr or 10-40 μmol/day (SI units) [1] Female levels are lower than those of males. Also note that the urine and plasma levels of 5-HIAA vary with the intake of certain foods rich in serotonin and medications that either increase or decrease ...
Plasma 5-Hydroxyindole Acetic Acid as a Biomarker for Neuroendocrine Tumors Measuring a single fasting plasma 5-HIAA level is much more convenient than the 24-hour urine collection. A recent study compared the 2 assays in a group of 115 individuals with all types of NETs (among which 72 had...
Measurement of the serotonin breakdown product 5-hydroxyindoleacetic acid (5-HIAA) in urine is important in diagnosing and monitoring of patients with intestinal neuroendocrine tumors. Our aim was to compare 5-HIAA measurement in 24-hour urine sampling with overnight (approximately 8-hour) sampling...