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Black Urine

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Black Urine
A clinical finding which may be pathological or nonpathological

Pathological Excess of various pigments, including homogentisic acid—e.g., methemoglobin, haemoglobin, alkaptonuria
Nonpathological Presence in the urine of cascara, iron-sorbitol-citric acid complexes, levodopa, radiocontrast media, methocarbamol, naphthol, phenols, pyrogallol, salicylates, diatrizoates


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For example, a dark yellow to orange color may signify the presence of bilirubin, which is indicative of liver disease and/or biliary-tract obstruction, while brown and/or black urine may be caused by the presence of melanin or homogentisic acid.
 
 
 
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