Purple Urine Bag Syndrome: A Rare Spot Diagnosis

Table 2

Risk factors for purple urine bag syndrome [4].

Risk factor	Mechanism
Female gender	Anatomy predisposed to UTIs
Increased dietary tryptophan	Increased substrate for conversion
Increased urine alkalinity	Facilitates indoxyl oxidation
Severe constipation	Increased time and substrate for bacteria
Chronic catheterisation	Increased UTI risk
High urinary bacterial load	Bacterial sulphatase/phosphatase availability
Renal failure	Impaired indoxyl sulphate clearance