The presence of abnormal amounts of protein in urine, typically indicating kidney damage or disease. Normal urine contains very little protein, so its presence suggests the kidney's filtering system is compromised.
From 'protein' and Greek 'ouron' meaning 'urine,' literally meaning 'protein in urine.' The term emerged as laboratory techniques developed to detect proteins in urine samples in the 19th century.
Proteinuria is like having a broken coffee filter—normally your kidneys keep large molecules like proteins in your blood, but damaged filters let them leak through! Foamy urine that looks like beer head is often the first sign patients notice, though by then significant kidney damage may have already occurred.
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