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When kidneys are working correctly, they retain protein and just excrete unwanted substances, mainly uric acid. However, if the kidney is damaged, then protein can leak into the urine.
IgA Nephropathy is a kidney disease. It is more like a disorder, where the IgA-protein that helps the body fight infections, settles in the kidneys. Ultimately this results in a buildup of this protein in the kidneys, and later causes the kidneys to leak blood or protein in the urine.
Colored Urine, Protein in urine, back pain right where the kidneys are.
Typically excess protein is caused by lupus' effect on the kidneys; excess urine protein doesn't cause lupus.
Not a good sign it indicates your blood is not being filtered properly which is your kidneys job if you have protein in your urine may be an indication of kidney failure
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If there is protein in urine, there is something wrong with the filtration process in the kidneys. Normally, proteins molecules that are too large to enter the filtrate in the nephron of the kidney. If protein were to make it into the filtrate, then the kidneys are taking too much out of the blood and that could be disasterous
This question is slightly imprecise in its phrasing. All human cells and organs contain protein, so it is inevitable that kidneys contain protein; you cannot have kidneys without protein. However, what you are probably thinking of is the protein albumen, leaking from the kidneys into the urine. That is a sign of kidney damage, probably caused by a kidney stone.
They are too big to pass through the filter in the kidneys
The full name is the microalbumin to creatinine ratio. Microalbumin is a test used to detect small amounts of protein in the urine, which is an indicator of kidney damage. Healthy kidneys don't allow any protein to leak out into the urine. Creatinine is a normal waste product that indicates how concentrated the urine is. The microalbumin ratio gives you a number, in the units milligrams of albumin per grams of creatinine, that indicates if your kidneys are functioning properly. The lower the number is, the better.
Because the kidneys are supposed to prevent the loss of things essential for your body, such as protein.
The kidney is "designed" to 1) not leak proteins and 2) to reabsorb any that do get into the urine.