Nephrotic syndrome is a renal pathology defined by a tetrad — proteinuria exceeding 3.5 g/24h, hyperlipidemia (hypercholesterolemia), hypoalbuminemia, and peripheral edema — that arises from immune- or inflammation-mediated podocyte injury to the glomerulus, which normally acts as a selective barrier against protein loss. The mechanism links glomerular barrier failure to systemic consequences through two downstream pathways: hepatic compensation for protein loss (driving hypercholesterolemia) and reduced plasma oncotic pressure (driving fluid shift into the interstitium, decreased vascular volume, decreased GFR, and compensatory renin-angiotensin-aldosterone activation that paradoxically worsens edema). This places nephrotic syndrome within renal medicine/nephrology as a glomerular disease entity distinguished from nephritic syndromes by its pathophysiologic basis in barrier dysfunction rather than primarily inflammatory hematuria.
Nephrotic syndrome is a renal pathology defined by a tetrad — proteinuria exceeding 3.5 g/24h, hyperlipidemia (hypercholesterolemia), hypoalbuminemia, and peripheral edema — that arises from immune- …