Our kidney is just like a micro-filtration machine, which can be divided into three layers from inner side to outer side: endothelial cells, basilar membrane and epithelial cell. In all of the three layers, there are filtration pores and negative discharges, so the barrier can be divided into two kinds: mechanism barrier: pore and discharge barrier: negative discharge. In normal condition, kidney can filtrate the excessive water and toxins, etc, which can keep balance as well. For patients with chronic kidney disease, inflammatory reaction damaged kidney filtration barrier, thus causing protein in urine or proteinuria.
Generally, proteinuria looks foamy and yellowish. The foam does not disappear for a long time, which is in the surface of the urine. Generally, we should develop a good habit of testing urine and blood 2 twice every year for kidney disease has no clinical Immunotherapy for a long time. Even though there is foam in urine, people will not beware of it due to lack of medical common sense.
