Understanding urine tests - InformedHealth.org -
2010-7-27 · If too little of the metabolic product creatinine is being filtered out of the blood by the kidneys, the kidneys may not be working properly. High levels of protein in urine, known as proteinuria, can be caused by conditions such as heart failure, diabetes, inflammation of the renal pelvis, urinary tract infections, kidney disease or kidney cancer.
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