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Questions and Answers
Which urine color is associated with concentrated specimens and is generally normal after exercise?
What urine color indicates the presence of bilirubin, characterized by yellow foam when shaken?
Which color of urine would fully correspond to a positive test for blood with visible RBCs under a microscope?
What is the likely color of urine resulting from myoglobin, characterized by clear urine and positive blood results?
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Which cause is associated with alkaline urine after standing and produces a brown/black color?
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Study Notes
Urine Color and Associated Causes
- Dark yellow urine can be caused by dehydration or concentrated specimen, which is normal after exercise or in the first morning specimen.
- Yellow-green urine can be caused by bilirubin, which is indicated by a positive test for bilirubin.
- Yellow-green urine can also be caused by biliverdin.
- Port-wine colored urine can indicate the presence of porphyrins, but will have a negative blood test.
- Brown or black urine can indicate the presence of homogentisic acid, a condition known as alkaptonuria. This urine will become alkaline after standing.
- Black urine could indicate the presence of melanin.
- Pink urine can be caused by red blood cells, resulting in cloudy urine and a positive test for blood. Red blood cells will be visible under microscopic examination.
- Red urine can be caused by hemoglobin or myoglobin. Both will result in clear urine and a positive test for blood. Hemoglobin is associated with intravascular hemolysis, while myoglobin is associated with muscle damage.
- Red urine can also be caused by the consumption of beets.
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Description
Test your knowledge on the various colors of urine and their associated causes. This quiz covers conditions that lead to specific urine colors, including dark yellow, yellow-green, and port-wine colors. Understand the medical implications related to different urine appearances.
