Nephrotic syndrome is a nonspecific disorder in which the kidneys are damaged, causing them to leak large amounts of protein (proteinuria at least 3.5 grams per day per 1.73m2 body surface area) from the blood into the urine.
Kidneys affected by nephrotic syndrome have small pores in the podocytes, large enough to permit proteinuria (and subsequently hypoalbuminemia, because some of the protein albumin has gone from the blood to the urine) but not large enough to allow cells through (hence no hematuria). By contrast, in nephritic syndrome RBCs pass through the pores, causing hematuria.
Read more about Nephrotic Syndrome: Signs and Symptoms, Causes, Diagnosis, Complications, Prognosis
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