Tubular proteinuria is the presence of more than 150 mg small proteins (such as alpha 2-microglobulin) in a 24-h urine collection, while the serum proteins have normal concentrations. Non-selective glomerular proteinuria is the increased excretion of more than 3000 mg proteins of any size in a 24-h urine collection. Selective glomerular proteinuria is the increased excretion of more than 300 mg medium-sized negatively charged proteins such as albumin in a 24-h urine collection. Microalbuminuria is the presence of more than 30 mg and up 300 mg albumin in a 24-h urine collection. Causes are fever, exercise, orthostasis, exposure to heat and cold, heart insufficiency or drugs. Proteinuria up to 500 mg/24 h without the presence of a kidney disease is called functional proteinuria. Protein in the urine should be in the range of 50–150 mg in a 24-hour urine collection. Proteinuria is the presence of excess serum proteins in the urine. You are here: Urology Textbook > Signs and symptoms > Proteinuria Proteinuria: Causes of Protein in Urine Definitions of Proteinuria
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