What is the medical term meaning purple urine?

The medical term for purple urine is "purple urine bag syndrome" (PUBS). It is a rare condition that can occur when certain bacteria, such as Pseudomonas aeruginosa or Proteus mirabilis, break down the amino acid tryptophan in the urine. This can cause the urine to turn purple, blue, or green. PUBS is usually not harmful, but it can be a sign of a urinary tract infection (UTI), so it is important to see a doctor if you experience this symptom.