Which statement best distinguishes nephrotic syndrome from nephritic syndrome on urinalysis?

Which statement best distinguishes nephrotic syndrome from nephritic syndrome on urinalysis?

• A. Massive proteinuria with lipiduria
• B. Hematuria with RBC casts
• C. Pyuria with bacteriuria
• D. Normal protein excretion

Answer: (A)

The urinalysis distinction between nephrotic and nephritic syndromes centers on what is lost or shed into the urine. In nephrotic syndrome you see massive proteinuria with lipiduria, reflecting a severe loss of protein across a damaged glomerular filter and the liver’s compensatory lipid production; this combination—very high protein in urine plus lipids in the urine (often with oval fat bodies)—is a hallmark. In nephritic syndrome the urine more characteristically shows hematuria with red blood cell casts, indicating glomerular inflammation and bleeding, with only mild to moderate proteinuria. Pyuria with bacteriuria suggests a urinary tract infection rather than a primary glomerular disease, and normal protein excretion would not fit nephrotic syndrome. Therefore, massive proteinuria with lipiduria is the best distinguishing urinalysis feature.

The urinalysis distinction between nephrotic and nephritic syndromes centers on what is lost or shed into the urine. In nephrotic syndrome you see massive proteinuria with lipiduria, reflecting a severe loss of protein across a damaged glomerular filter and the liver’s compensatory lipid production; this combination—very high protein in urine plus lipids in the urine (often with oval fat bodies)—is a hallmark. In nephritic syndrome the urine more characteristically shows hematuria with red blood cell casts, indicating glomerular inflammation and bleeding, with only mild to moderate proteinuria. Pyuria with bacteriuria suggests a urinary tract infection rather than a primary glomerular disease, and normal protein excretion would not fit nephrotic syndrome. Therefore, massive proteinuria with lipiduria is the best distinguishing urinalysis feature.