Plasma Serotonin, 24hr Urinary Serotonin, 24hr Urinary 5HIAA
Plasma Serotonin, 24hr Urinary Serotonin, and 24hr Urinary 5HIAA tests measure serotonin levels and its metabolite, 5HIAA, in the blood and urine to help diagnose serotonin-secreting tumors, such as carcinoid tumors, or monitor related conditions.