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Table 3 Common causes of abnormal urine color

From: Purple urine bag syndrome in benign prostatic hyperplasia patient

Color Cause
Colorless Very dilute urine
Overhydration
Cloudy/milky Phosphaturia
Pyuria
Chyluria
Red Hematuria
Hemoglobinuria/myoglobinuria
Anthocyanin in beets and blackberries
Chronic lead and mercury poisoning
Phenolphthalein (in bowel evacuants)
Phenothiazines (e.g., Compazine)
Rifampin
Orange Dehydration
Phenazopyridine (Pyridium)
Sulfasalazine (Azulfidine)
Yellow Normal
Phenacetin
Riboflavin
Green-blue Biliverdin
Indicanuria (tryptophan indole metabolites)
Amitriptyline (Elavil)
Indigo carmine
Methylene blue
Phenols (e.g., IV cimetidine [Tagamet], IV promethazine [Phenergan])
Resorcinol
Triamterene (Dyrenium)
Brown Urobilinogen
Porphyria
Aloe, fava beans, and rhubarb
Chloroquine and primaquine
Furazolidone (Furoxone)
Metronidazole (Flagyl)
Nitrofurantoin (Furadantin)
Brown-black Alcaptonuria (homogentisic acid)
Hemorrhage
Melanin
Tyrosinosis (hydroxyphenylpyruvic acid)
Cascara, senna (laxatives)
Methocarbamol (Robaxin)
Methyldopa (Aldomet)
Sorbitol
  1. From [4]