The presence of fibrin in the urine, which may indicate kidney disease or severe systemic illness.
From fibrin + -uria (Greek ouron, urine). This medical term was developed in the 19th century as doctors learned to identify substances in urine.
Finding fibrin in your urine is like finding blood cells where they shouldn't be—it's a red flag that your kidneys might be leaking important proteins, which shouldn't happen in a healthy person.
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