© 2001 Journal of Clinical Pathology
Correspondence
A case of purple urine bag syndrome associated with Providencia rettgeri
Department of Chemical Pathology and Microbiology, St Helens and Knowsley Hospitals NHS Trust, Warrington Road, Prescot, Merseyside L35 5DR, UK
We would like to report this interesting case of an elderly lady (85 years old) who has been passing violet coloured urine over the past four weeks. She is living in a nursing home and has a long term urinary catheter. There were no other symptoms but her general practitioner was worried about urine discolouration and sent three urine samples to the biochemistry department on three separate occasions to identify the cause of the violet colour. There was no history of intake of medication, food colouring, or special food items that may alter the urine colour. The urine sample was alkaline (pH 8.5) with a strong smell of ammonia. It was centrifuged and a precipitate of fine blue crystals was identified in the sediment. The supernatant was clear and purple coloured, and was negative for haemoglobin, myoglobin, and porphyrins. At this stage, the purple urine bag syndrome (PUBS) was suspected
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