Authors' response

摘要

To the Editor: We are pleased that our article could be viewed as a useful tool for clinicians who encounter patients with urine discoloration. Dr Chong is indeed correct that the purple discoloration from purple urine bag syndrome seems to occur from staining of the polymer used in making a Foley bag. We reread our discussion of the patho-physiology of this disorder and saw that we did not fully emphasize this point and may have led readers astray. Regardless of the exact color of the urine outside the bag, because the urine looks purple once the condition is discovered by the patient or caregiver, we prefer to describe it as purple urine.