Does protein in urine always mean kidney dysfunction?

No. It is possible to have isolated proteinuria in which case there is protein in the urine (no greater than 3g/24h) but no other abnormalities in urine or blood tests, as well as no symptoms associated with kidney problems and a normal physical exam. It is a diagnosis of exclusion.
No. Other causes range from bladder infection to a few percent of people who get protein in the urine just from standing up -- we pick these folks up because the first-voided morning urine has little or no protein.

Related Questions

Is it still possible to have kidney dysfunction with bun of 32 for 3 yr old creatinine of. 1 and no protein in urine? Child has edema in face often

Odd issues. The normal creatinine & lack of protein in the urine are good signs for kidney function.Yet an elevated bun suggests and facial edema are odd and can be triggered by non-kidney issues. A look into other possibilities is needed. Read more...

What is protein in urine mean if kidney disease?

Many causes. Renal disease from causes like diabetes, sle, and others accounts for the major reasons for protein in the urine. Protein should not be in the urine. The kidney basement membrane is supposed to keep it out. If it isn't intact, protein leaks out. In burns, accidents, etc., things like myoglobin leak out, and in poststrep. Glomerulonephritis, anythhing can leak out, but these resolve with rx.. Read more...
Kidney issues. There can be a small amount of protein (<30mg) seen on a 24 hr urine specimen, but anything above that could indicate kidney disease. Generally the greater amount of protein, the more serious the disorder. A nephrologist can help diagnose kidney problems based on the urine findings, other lab tests, your history and exam. Sometimes a kidney biopsy is necessary for diagnosis. Best of luck. Read more...
Recheck urine. I agree. You can see protein in urine after exercise in some individuals and teenage can have orthostatic proteinuria. Where protein will appear in the urine on ambulation and it disappears when lying down. I think the next step would be to have. A repeat urine first urine in the morning and no exercise for 24 hours before the sample. I would have the doctor measure the protein creatinine rat. Read more...
Proteinuria. Proteinuria (p), protein in urine, is can be a sign of a disease and not a diagnosis. P needs to be evaluated by a 24 hour urine collection to quantify the amount of p/day. Blood will also need to be taken to arrive at a diagnosis. See a nephrologist for a full evaluation and you will find out if your p is a sign of a serious disease or a benign problem. Read more...

Why could protein in urine be a sign of kidney damage?

Damage to kidney. Generally protein is filtered out from the urine by the kidney and when there is a problem with the filter "kidney" it cannot maintain the function and nephrologists , kidney doctors have to investigate the cause , which may be serious. Read more...
It can be a sign. Proteins are normally filtered through the kidney and sent back into the blood. If there is protein in the urine it means there are holes in the system that are allowing the protein to leak out. This leak can be caused by damage to the kidney. That is why physicians will check patient's urine for proteins as it is a sign of kidney damage. Read more...

How is it that protein in urine may be a sign of kidney damage?

Nephron damage. Think of the kidney as a filter. This filter is intended to wash out the impurities in your blood, but designed to retain the proper nutrients, blood cells, proteins, etc your body requires. When there is damage to these filtration units (nephrons) in the kidneys, the filtration becomes less efficient and proteins are commonly lost into the urine. Read more...