Most cases of proteinuria can be classified as glomerular, tubular, or overflow proteinuria.

Glomerular proteinuria

  • Urine total protein: 1-20 g/day.
  • Passage of protein from glomerular capillary blood (mainly albumin) into the urine.

Tubular proteinuria

  • Urine total protein: <2 g/day.
  • Passage of low molecular weight proteins (e.g., retinol-binding protein, alpha-2-microglobulin, beta-2-microglobulin) into the urine.

Overflow proteinuria

  • Urine total protein: up to 20 g/day.
  • Overproduction of small proteins (e.g., myoglobin, light chains) leads to increased glomerular filtration and appearance in the urine.

 

 

Read more here

http://www.aafp.org/afp/2000/0915/p1333.html

https://www.uptodate.com/contents/assessment-of-urinary-protein-excretion-and-evaluation-of-isolated-non-nephrotic-proteinuria-in-adults

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