<unk>  syndrome can be classified into primary or secondary depending on the underlying etiology.  Primary (idiopathic)<unk>  syndrome is defined as<unk>  syndrome due to a primary glomerular disease. The secondary<unk>  syndrome is defined as<unk>  syndrome due to a primary etiology other than glomerular disorders, such as infections, malignancies, systemic conditions, and medications.
Nephrotic syndrome classification
Hepatorenal syndrome classification
Acute tubular necrosis classification
Acute kidney injury classification
KDIGO guidelines classification scheme
Renal artery stenosis classification
Chronic renal failure classification
Adrenal insufficiency classification