A patient is on long standing indwelling catheter and now the catheter bag is turned purple. Dipstick test shows nitrates –ve, blood+. What investigation would you do next?
- A. Urine culture and sensitivity
- B. None
- C. Urine porphobilinogen
- D. USG abdomen
Ans. The key is C. Urine porphobilinogen. This is wrong key. Correct key for this question is B. None. [This is a case of purple urinary bag syndrome for which we do urine RME that shows no nitrates and blood cells positive. pH is alkaline (>7). Sometimes culture is done but sensitivity is not needed as no antimicrobial treatment is recommended].