Glomerular proteinuria results from increased transcapillary passage of proteins and is characterised by the loss of plasma proteins equal to or greater than albumin, eg. glomerular nephritis, nephritic syndromes and chronic kidney disease.
Tubular proteinuria results from a decrease in the capacity of the tubules to reabsorb protein and results in an increase in excretion of low molecular weight proteins, eg. Fanconi syndrome.
Overflow proteinuria occurs when increased serum concentrations of proteins of low molecular mass are filtered through the glomerulus and exceed the reabsorptive capacity of tubules, eg. Bence-Jones proteinuria, haemoglobinuria, myoglobinuria.
|Random||:|| <20 mg/mmol creatinine
|24 hour urine collection||:||<0.15 g/24 h|
Random urine (preferred) or 24 hour urine collection
Random urine: 1 mL
or 24 hour urine collection
Random urine: 1 day
24 hour urine: 2 days