Diagnostic Approach to Abnormal Urine Colors: Lessons From a Case of Blue-Green Urine

Abnormal urine coloration can be a perplexing finding in clinical practice, often prompting concern among both patients and healthcare providers. While cases of red, brown, and yellow urine are more commonly encountered, blue-green urine remains a rare and under-researched phenomenon. This case report describes an elderly patient presenting with an incidental finding of blue-green urine, exploring its potential etiologies and emphasizing the importance of clinical history in identifying benign versus pathological causes.