appearance blood urine hematuria protein urine proteinuria pus cells urine pyuria cancer cells urine hour urine collection used used quantify daily protein loss see proteinuria urine output creatinine clearance electrolyte handling renal tubules common measure protein loss small random sample urine basic blood tests used check concentration hemoglobin white count platelets sodium potassium chloride bicarbonate urea creatinine albumin calcium magnesium phosphate alkaline phosphatase parathyroid hormone pth blood
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