Proteinuria is a condition in which the patient has an excess amount of serum proteins in the urine. The kidneys are not able to filter the excessive protein from the blood resulting in chronic kidney disease (CKD). The kidneys filter a variety of the waste that ensures that all the nutrients and another acid like amino acids are left in the body.
Proteinuria means the kidneys are not working properly to hold the protein in the blood, and resultant you got protein dripped along with the urine. It is your kidney's job to filter the blood, keep the important substance, and eliminate waste that comes because of various chemical reactions, along with the urine.