Purple discoloration of a urinary catheter bag is most characteristically associated with?
A. Beetroot Consumption
B. Chronic Catheter + E.Coli UTI
C. Rifampicin
D. Acute Porphyria Attack
Answer and Explanation:
Answer: B. Chronic Catheter + E. coli UTI
Explanation:
Purple discoloration of a urinary catheter bag is called Purple Urine Bag Syndrome (PUBS).
It is seen in chronically catheterized patients, especially elderly women with constipation. Caused by bacterial UTI (commonly E. coli, Klebsiella, Providencia, Pseudomonas, Proteus, Enterococcus).
Bacteria metabolize tryptophan → indoxyl sulfate → converted into indigo (blue) and indirubin (red), which mix to give a purple discoloration of the urine bag.
Other options:
A. Beetroot consumption → causes reddish urine, not purple.
C. Rifampicin → causes orange-red urine, not purple.
D. Acute porphyria attack → causes dark/reddish-brown urine on standing, not purple.