The presence of albumin (protein) in the urine, which is usually a sign of kidney disease or damage.
From Latin 'albumen' (white of egg) + Greek 'ouron' (urine), literally 'albumin in urine.' Named in the 19th century when physicians could finally detect proteins in body fluids.
Finding protein in urine was revolutionary—suddenly doctors had a simple test to diagnose kidney problems, and this condition became one of the first 'bio-markers' in medical history!
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