The presence of blood in urine, which can be visible (gross hematuria) or only detectable under microscopic examination (microscopic hematuria). It may indicate infection, kidney stones, trauma, or more serious conditions like cancer.
From Greek 'haima' meaning 'blood' and 'ouron' meaning 'urine,' literally meaning 'blood in urine.' The term has been used in medical literature since the recognition of blood as an abnormal urinary component.
Hematuria can turn urine anywhere from pink lemonade to Coca-Cola color, but sometimes there's blood present that you can't even see! Even a tiny amount of blood can make urine look dramatically red because blood cells are incredibly pigmented—just one milliliter of blood in a liter of urine creates a noticeable color change.
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