The finding of increased amounts of the serotonin degradation product 5-HIAA in the urine indicates:
A) Platelet disorders
B) Intestinal obstruction
C) Malabsorption syndromes
D) Argentaffin cell tumors

Question

Quizplus · Accepted Answer

Increased amounts of the serotonin degradation product 5-HIAA in the urine is a hallmark of carcinoid tumors arising from argentaffin cells. The breakdown of serotonin by these tumors leads to an excess of 5-HIAA in the urine. Platelet disorders, intestinal obstruction, and malabsorption syndromes are not associated with elevated 5-HIAA levels in the urine.

The Finding of Increased Amounts of the Serotonin Degradation Product