A 77-year-old woman arrived at a Florida emergency department after a fall that broke her right wrist. During her workup, staff collected a urine sample. It was an unmistakable blue-green.
The most likely explanation, emergency physicians at the University of South Florida Morsani College of Medicine in Tampa reported in a case report in Cureus, was a pill she took to prevent urinary tract infections. It contained methylene blue, a dye that can tint urine blue or green.
