Double dye test is useful for diagnosing vesicovaginal or ureterovaginal fistulae. For this test, the patient takes oral phenazopyridine (Pyridium) 200 mg three times a day, and indigo carmine or methylene blue is filled into the empty urinary bladder via a urethral catheter.
Double dye test is useful for diagnosing vesicovaginal or ureterovaginal fistulae. For this test, the patient takes oral phenazopyridine (Pyridium) 200 mg three times a day, and indigo carmine or methylene blue is filled into the empty urinary bladder via a urethral catheter.
Source: Wikipedia "Double dye test" · CC BY-SA 4.0
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