Which finding best distinguishes nephrotic syndrome from nephritic syndrome?

• A. Hematuria and red cell casts without edema
• B. Massive proteinuria with hypoalbuminemia and edema; hyperlipidemia
• C. Rapidly progressive renal failure with C3 complement decrease
• D. Primarily hematuria with athlete's edema

Answer: (B)

The main idea is that nephrotic syndrome is defined by heavy protein loss in the urine, which leads to low albumin in the blood, edema, and often high cholesterol. When the kidneys leak a lot of protein, the blood’s oncotic pressure drops, so fluid shifts into the tissues and you get edema. The liver responds to hypoalbuminemia by making more lipoproteins, causing hyperlipidemia.

So, the finding described—massive proteinuria with hypoalbuminemia and edema, plus hyperlipidemia—is the classic pattern that sets nephrotic syndrome apart from nephritic syndrome. Nephritic syndrome, in contrast, centers on inflammation with blood in the urine (hematuria) and often red blood cell casts, sometimes with hypertension and reduced urine output, but not with the heavy protein loss seen in nephrotic syndrome.

The other options reflect nephritic features (hematuria with casts; rapid decline in kidney function with low C3) or a mix that doesn’t capture the hallmark heavy proteinuria with hypoalbuminemia and edema of nephrotic syndrome.