Asymptomatic urinary tract infection manifesting as purple urine

Purple urine bag syndrome (PUBS) is an uncommon but visually striking condition characterized by purple discoloration of urine. It occurs due to the production of pigments that result from tryptophan metabolism by certain bacteria (Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis, Escherichia coli, Providencia spp). We discuss a case of PUBS in a male with obstructive uropathy and long-term catheterization. This report emphasizes the clinicians to consider PUBS when encountering purple urine, particularly in patients with risk factors such as long-term catheterization and urinary tract infections. Management of PUBS involves periodic catheter change, alleviation of risk factors and stringent sanitation practices.