Why may protein in urine be a sign of kidney damage?What structures in the kidney are probably affected?

Why may protein in urine be a sign of kidney damage?What structures in the kidney are probably affected?Why may protein in the urine be a sign of kidney damage? What structures in the kidney are probably affected?

Posted by Joe
Your kidneys have many types of filtration systems within them (nephrons) which have holes that are only large enough for things like water and small waste molecules to pass through, if larger molecules such as protein or blood cells pass then it typically means there's either injury or an infection in which is allowing for larger cells to pass to try and fix the problem.

Posted by Kelle
See this paragraph:

Microalbuminuria and Proteinuria

http://kidney.niddk.nih.gov/kudiseases/pubs/yourkidneys/

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