A hereditary condition where dark pigment is present in the urine.
A rare inherited disorder marked by the excretion of large amounts of homogentisic acid in the urine, a result of incomplete metabolism of the amino acids tyrosine and phenylalanine. Presence of the acid is indicated by the darkening of urine on standing or when alkalinated and the dark staining of diapers or other linen.
A congenital condition in the body, identified by the presence of homogentisic acid in the urine, commonly known as alcaptonuria.