3 results
Alkaptonuria (Black Urine Disease)
Urine turns dark when left standing due to oxidation of homogentisic acid 
Clinical
Alkaptonuria (Black ... phenylalanine #Alkaptonuria
Possible Causes of Altered Urine Color 

Red 
    Foods: beets, blackberries, rhubarb
Porphyria. alkaptonuria
Causes Abnormal Urine Color - Differential Diagnosis
Turbid White Urine (Albinuria):
 • Chyluria, Filariasis, Schistosomiasis, Malignancy, Phosphaturia,
Black Urine: • Alkaptonuria