On your nightshift, the bedside nurse asks you to review a 65-year-old female with red urine in her indwelling urinary catheter bag.
When the urine is red and free of haem pigments (e.g. erythroctyes, haemoglobin or myoglobin), then the urine may be discoloured and described as 'raspberry', or 'cherry-red'
Normally, urine is some shade of yellow with acid urine usually a darker colour than alkaline urine. Pathologically, it may be any colour.