Related Experiment Video
Updated: Aug 8, 2026

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
Indoxyl sulphate and the purple urine bag syndrome: a case report
W Achtergael1, D Michielsen, F K Gorus
1Laboratorium Klinische Chemie, Academisch Ziekenhuis Vrije Universiteit Brussel, Brussel, België. Wim.Achtergael@az.vub.ac.be
Abstract:
A case of purple urine bag syndrome, a rare condition in which the urinary catheter bag of chronically catheterised patients develops a discolouration, is reported. The excretion of indoxyl sulphate, an intermediate in the causal mechanism of this unusual phenomenon, was measured using Ehrlich's reagent and found not to be elevated in this 77 year-old man, when compared to elderly male control subjects.
Related Concept Videos
Imaging Studies V: Intravenous Urography and Retrograde Pyelography
Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care
Acute Pyelonephritis II: Diagnostic Studies and Management
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Jaundice

