Recognizing purple bag syndrome at first look
Caterina Canavese1, Andrea Airoldi, Marco Quaglia
1Nephrology and Transplantation Unit, Department of Translational Medicine, and International Research Centre Autoimmune Disease, Amedeo Avogadro University, Novara, Italy. ccanavese@hotmail.com
Journal of Nephrology
|September 4, 2012
Summary
Purple urine bag syndrome causes alarming urine discoloration due to bacterial enzymes acting on tryptophan metabolites. This usually benign condition requires treating underlying bacteriuria and constipation, not invasive tests.
Area of Science:
- Nephrology
- Clinical Microbiology
Background:
- Purple urine bag syndrome (PUBS) is a rare clinical observation characterized by distinct urine discoloration.
- Historically, PUBS has prompted unnecessary invasive diagnostic procedures due to clinician concern.
Observation:
- Patients with PUBS present with urine that appears purple in the collection bag and dark blue in a test tube.
- This phenomenon is linked to the presence of specific pigments, indirubin and indigo.
Findings:
- PUBS results from the interaction of bacterial enzymes (indoxyl phosphatase/sulfatase) with urinary tryptophan metabolites in alkaline urine.
- Gram-negative bacteria are implicated in the enzymatic conversion leading to pigment formation.
Implications:
- Physicians should recognize PUBS as a typically benign condition in asymptomatic patients.
- Management involves addressing bacteriuria with antibiotics, preventing constipation, catheter management, and urine acidification.
- Successful treatment leads to the resolution of urine discoloration.
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